Lady Jane Blayney (his daughter-in-law), has Sir Edward as the son of John Blayney of Tregynog. , whereas John was the son of Edward. Other sources such as Lodge's Peerage of Ireland have Sir Edward as the 3rd son of Thomas Blayney and Gwenthlean which is discussed and (in my view) disproven on the Blayney page.
About 1602 he married Anne Catherine Loftus (b.1567 Rathfarnham, Co Dublin), second (5th child) daughter ofRev Dr Adam Loftus D.D. b.22Jun1533 (Dublin), Archbishop of Dublin and Lord Chancellor of Ireland) and Jane Purdon (b~1536 at Rathfarnham, Dublin)
Edward was her third husband, the previous being Sir Henry Colley (~1587/90) (Knight) of Castle
Carbery, co Kildare (d.1601) then Captain George Blount of Kidderminster (~1596) . George Blount and Anne had a daughter, Elizabeth Blount b.1596 who also had three husbands, Robert Blayney (1592-1625) m.~1617 (Dublin) then after Robert's death, Thomas Clotworthy then Francis Clotworthy . Her cousin (on the Loftus side) married Captain Robert Morgan. 
In the "Onegreatfamily.com"  and , Anne Loftus is married to Edward Blainey at the same time so I guess some people use Blainey and Blayney interchangeably.
See Comment 8 on the Loftus descent from and to British royalty including QEII.
Submission of Gaelic chieftains [Derricke]
It has been claimed that Edward went to Ireland in 1575 to become the 1st Baron Blayney , but records of him signing leases exist in 1591 in Churchstoke, Powys . Edward saw military service in Spain and in the Lowlands (serving Queen Elizabeth) rising ("by his valour and conduct") to the rank of Colonel. In fact he accompanied Robert, the Earl of Essex to Ireland in 1598 , , ,  "where he performed many great and acceptable services" . He was in command of 100 foot soldiers in Leinster in 1598 and commanding 150 at Newry in 1599. Distinguished himself at The Four Mile Water in 1600 and was at the siege of Kinsale in 1601 and became Governor of Mount Norris that year after helping defeat the MacMahones, and made Governor of the garrison of Monaghan in 1602 and Captain of 150 Horsemen .
For his bravery, Edward was knighted at Dublin Castle in 1603 by the Lord Deputy, Lord Mountjoy and made seneschal and governor of County Monaghan in 1604 . He was then granted land by King James I in 1607 (the 32 townlands of Ballynalurgan) to be "forfeighted if he does not build a strong castle surrounded withy a stone trench, called a bawne, within the next four years" . In 1611 he was granted the termon of Muckno . He built the castle (using the stones of a destroyed Franciscan friary) on Lough Muckno , around which the Castleblayney village grew .
See description of how Edward won his knighthood Comment 6
Technically the Muckoo territory did not come under the general terms of the "Plantation of Ulster", which took place some years later . O'Flaherty claims "with the coming of the Blayney the Catholic religion was repressed"  but history shows that the Blayneys did try to integrate, and Edward's youngest daughter (Lettice) married an O'Neil. By the 1700s they were even marrying into the Mahon clan.
He held the office of M.P. for County Monaghan between 1613 and 1615 in King Jame's parliaments (Knight for the county of Monaghan ) and was invested as a Privy Counsellor (P.C.) [for Munster, Ireland] in 1615.
He was elevated to the peerage of Ireland as Baron Blayney of Monaghan by King Charles I by privy seal dated Westminster, January 24 1621  and by patent at Doublin on 29 Jul 1621  as the first Lord Blayney, Baron of Monaghan (with a seat in the Irish House of Lords) "in consideration of his services as an able Counsellor during the peace, and of his great services in the Wars of the Low Countries, Spain, and Ireland, and his experiences in all military affairs" [ p 198]. He was required to "plant" six English tenants with an estate for lives on these lands. In 1622 he built a Church of Ireland church at Castleblayney. Contary to many beliefs, a conveyance of 4 May 1622 shows that Sir Edward Blayney, Kt, tenant-in-chief to the Crown, had left the native proprietors, mainly the McMahons, in possession and that they subsequently sold out to incomers ,  and [Monaghan].
See praise from King Charles (pleased by privy seal, dated at Westminster 24 January 1620) Comment 7
Lord Blayney did not do well financially, and it was the need for paying leaseholders, not an attempt to "plant Protestants" that motivated him to bring in Scotsmen. In 1624 he is quoted as saying: "To speak truly, the MacMahons are neither willing nor able to pay anything and that is the case of the whole country, for all is waste and now I am labouring to get Scottes..." 
Children of Edward and Anne: Sir Henry (2nd Lord) b.1602; John b~1602; ?Andrew b.1590/1610; Sir Arthur b.1603; Anne b.1605; Jane b.~1606; Mary b.1607; Elizabeth 1608; Martha b.1610 and Lettice b.1612.
1 Sir Edward BLAYNEY b.1570 d.11Feb1630 1st Lord Blayney
Bur. in the church of Monahan 23Feb1629
+Anne Catherine LOFTUS b.1567; d.1629  (Dublin) [see above]
2 Sir Henry BLAYNEY b.1602 d.1646 2nd Lord See Henry
Shien Castle, Monaghan
2 Sir Arthur BLAYNEY (Kt Bachelor) b.1603 d.11Feb1659.
The name Anthony has been used in error [see Comment 1].
The "younger son" of Sir Edward Blayney, the 1st Lord Blayney,
although named the second son by J D K Lloyd  and
S.P. Thomas  Of Shien Castle and MP for the borough
of Monaghan in 1634 but moved to Gregynog Hall, Montgomeryshire,
Wales on his marriage in 1642 to Joyce.
Sheriff of Montgomeryshire in 1644, Knighted 1648 for his conduct
in the battle of Beaumaris  [see Comment 1].
He never inherited Gregynog as he died in 1659 before the death
of John Blayney.
+ Joyce (Joyous), BLAYNEY (not Martha ) m.1642;
d.1661 bur. Tregynon
Heiress of Gregynog and Arthur's 1st cousin once removed.
[dau of Elizabeth LLOYD of Gregynon and John, son of Lewis BLAYNEY
(Sheriff of Montgomeryshire in 1630)]. See JoyceB
3 John BLAYNEY dsp?31Dec1667, Tregynon (the eldest, d.y. 
3 Edward BLAYNEY d.s.p.July1669 (in the Fleet Prison) 
Interestingly Edward was a Roman Catholic , while most Blayneys were staunchly Protestant,
possibly through his mother Joyce, whose mother Elizabeth LLOYD descended from the
+ Elizabeth SKIRMISHER  (Scrimshire/Skrysher/Skrymsher) b.1644 ); m.1666 
dau of John SRIMSHIRE of Norbury, Hertfordshire , ) [see Comment 3]
After the death of Edward, Elizabeth married Bernard FOSTER
3 Henry BLAYNEY Esq of Gregynog b~1649 (3rd son) d.Aug1691
bur. Tregynon [J.P. - see Comment 2]
+ Mary (Maria) (Elizabeth ) SEDDON (alias SIDNEY ) of Lancaster, b~1630; d.1707 bur. Tregynon.
dau of Anne (Elizabeth) dau. of Richard BLUNDEN Esq of Bishop's Castle  and
Rev Dr Lawrence SEDDON D.D. (alias SIDNEY ), b.1597/8; d.1675; Rector of
Worthyn (Worthen, Salop) in 1632 
The sidney/Seddon confusion has been clarified by B S DURRANT  with evidence of Dr Lawrence's
various graduations and appointments [DD, Prebendary of Hereford 1660 and of Putston Major, 1661].
Dr Lawrence SEDDON DD (Lambetth 1672, ie a Doctor of Theology) had a son,
Thomas SEDDON DD who assumed the name of SIDNEY when installed as a Precentor of the
Cathedral Church of Hereford 1684/5 
4 John BLAYNEY Esq. of Gregynog b.1680
Only son to reach adulthood (see below)
4 Mary BLAYNEY (eldest child) b~1671  d.1753
+(1)Blayney Owen of NewGrove, High Sheriff of Monaghan 1693 m.16Dec1700
aka Owen BLAYNEY
He had previously been married to Jane, dau of Richard BLAYNEY, 4th Baron
and was, along with Henry Vincent Blayney (5th Lord) "attainted"
by the Irish Parliament of King James II in 1689.
d. intestate 24Feb1708
5 Blayney OWEN b.1702 Newgrove, High Sheriff of Monaghan 1732
d. intestate 1750 [aka Owen BLAYNEY]
6 Blayney OWEN dsp. 
5 Mary Blunden Sidney OWEN (BLAYNEY) -see below
5 Euphemia BLAYNEY
+ James MARTIN d.1752
5 Elizabeth OWEN BLAYNEY b.6Jan1706; d.11Nov1707
5 Mary Blunden Sidney OWEN (BLAYNEY) m.1724 d.19Mar1778
Oldest daughter and co-heiress of her brother Blayney OWEN
+ William ROBINSON Esq
6 Charlotte ROBINSON m.20Mar1748 d.20Jan1799
Only child and heiress of William CAPPOG and ?Mary OWEN
dau of Blayney Owen of Newgrove
+ John MITCHELL Esq b.25Dec1726 d.10Apr1796
Son of Thomas MITCHELL b.1694 and Anne SLAKE b.1698
7 Blayney Owen MITCHELL b.Jan1751; d.23Feb1817
Well known Dublin attorney
+ Anne FOSTER (FORSTER)
8 Robert MITCHELL
8 Richard Henry MITCHELL
9 John MITCHELL b.1790 ...
9 Richard MITCHELL b.1800
9 William MITCHELL b.1800
9 Samuel MITCHELL b.1821; d.20Oct1865 ...
8 Joseph MITCHELL d.1839
9 John MITCHELL
9 Joseph MITCHELL
8 William MITCHELL b~1775; Reputedly killed in Dublin riots.
9 Rev William MITCHELL b.20Nov1803 Monaghan;
d.3Aug1870 in Perth, Western Australia
orphaned young, moved to Stackallen House, Co. Meath, Ireland,
the home of an uncle (under the care of a nurse).
In 1810 moved to live with grandfather, Blayney Owen Mitchell.
Worked as a missionary in India (Bombay), returning to England
with failing health of Mary, returned with 2nd wife for a while.
4Aug 1838 he arrived in W.A with Francis & three children
He was the first C of E minister to perform services in the
Swan River Colony & in 1838 he set up a school there. 
+(1)Mary Anne HOLMES b.1806; m.5Jan1826 (Piccadilly);
d.23Mar1831 (London, after returning from India)
10 Ann(nie) MITCHELL b.13Oct1826 (Bombay or Mumbai);
d.16Aug1917 (Cottesloe, WA, Australia)
+ Edward Lane COURTHOPE b.4Jan1803;
m.30Aug1848 (Middle Swan West Australia)
11 Four children
including Annie Frances COURTHOPE who married Nathan Knight.
10 Susan Augusta MITCHELL b.11Apr1828 (Bombay); d.30Sep1867
+ Philip La Mothe Snell CHAUNCY b.21Jun1816
11 Nine children
10 William Owen MITCHELL b.20Oct1829 (Bombay); d.4Aug1914
+ Isa Izon BICKLEY b.10feb1834; m.23Dec1853
11 Twelve children
+(2) Frances Tree TATLOCK b.6Jul1806 (London); Occ. school teacher;
m.24Jan1832 (England); went with William back to Bombay,
returning in 1834.
Went to Western Australia in 1838; d.1Jul1879 (Perth)
10 Blaney MITCHELL b.12Nov1832 (Bombay); d.16Aug1833
10 Samual MITCHELL b.5Feb1834(Bombay); d.26Sep1908
+ Mary Ann BISPHAM b.5Nov1852
11 Eight children
10 Frances Tree MITCHELL b.25May1841; d.1Jul1879
+Archdeacon James BROWN b.31Mar1820;
m.20Nov1856 (Middle Swan West Australia)
11 Ten children
10 Charlotte MITCHELL b.11May1843; d.6Sep1922
+(1)John ADAM b.16Nov1883 ....
+(2)Frederick Wyborn PARKER m.4Sep1867 ....
10 Andrew Forster MITCHELL b.7Mar1846; d.unm31May1870
9 Three other boys (also orphaned)
8 Blayney MITCHELL b.1779 (County Monaghan, Ireland);
d.Jan1868 (Clontarf, Dublin, aged 89)
Buried Clontarf Cemetery, Dublin, County Dublin, Ireland
9 Blaney MITCHELL d.1APR1893
8 Foster MITCHELL b.1785
8 Charlotte MITCHELL
+ Alexander Montgomery b.1780; m.Sep1800
7 Joseph MITCHELL 
7 Charlotte MITCHELL (married twice) d.17Jan1826
+(1)Richard SHERIDAN Esq, MP in Irish Parliament for Charlemont 
+(2)Warburton SOPMERVILLE, son of Sir Quaile Somerville, Bart. 
7 Henry MITCHELL Esq., of Drumreaske b.1766 d.26Jul1830
+ Mary JOHNSTONE m.1787
dau and heiress of John JOHNSTONE Esq., of Killabeel, Monaghan
8 Dorothea MITCHELL b.24Sep1795; d.Jan1857
8 Alexander MITCHELL b.7Jun1797; d.13Mar1843
8 Henry MITCHELL Esq., of Drumreaske, Monaghan b.27Dec1799;
+ Elizabeth STEVENSON (JOHNSTON );
dau of William STEVENSON Esq. of Springfield, Co., Antrim;
9 Eight children  (Henry -see below, William Stevenson
b.23JUN1825, Helena Stevenson b.14JUL1827,
Jane b.4JUN1831, Joseph Stevenson b.14FEB1839,
John Johnston b.30JUN1842, Mary & Elizabeth)
9 Henry MITCHELL b.12Aug1823 (sold Drumreaske 1864)
JP; High Sheriff (1861-2)
+ Mary ASHMORE m.31Aug1852
Eldest dau and co-heiress of Michael ASHMORE (Belfast) 
10 Fifteen children (Henry -see below, Richard Ashmore,
William Blayney, Lewis Blayney, Charles Ashmore,
Constance Mary, John Ashmore, Clement Alexander,
Katherine Charolett, George Thomas, Sydney Owen,
Clara Georgina, Francis Mary, Elizabeth Helena and
Edith May - all MITCHELL)
10 Henry ("Harry") MITCHELL b.6Feb1854
+ Harriette Ellen GLASGOW
11 Henry Blayney Owen MITCHELL b.1895
+ Sara Marguerite (Rita) BAXTER b.1895; m.1921
Co-heiress of Sir William James BAXTER (dep. Lord
Lieutenant of Co Londonderry) and Mary WALLACE
12 Edward Herbert Owen (Oscar) MITCHELL
Supplied a significant of support information on
Blayney ancestry as well as much of the Mitchell
+ Dr Marny Ann LLOYD-JACOB b.7Jun1931; m.28Sep1963;
d.19Feb2004; 2nd dau of Sir George LLOYD-JACOB (b.1897;
d.1969; Judge of the Chancery div. Royal High Court)
12 Dr John Blayney Owen MITCHELL
view family (?p/w problem)
12 Sarah Ardunn MITCHELL
view family (?p/w problem)
8 Charlotte MITCHELL b.7Jan1802
7 Samuel MITCHELL 
5 Euphemia OWEN d.1752
Co-heiress of her brother Blayney OWEN
+ James MARTIN Esq d.1752
6 Eleanor (Elinor)
5 Elizabeth OWEN b.1706 d.1707 (22 mths)
+(2)Captain Henry BARLOW m.1717 (2nd husband of Mary BLAYNEY)
5 John BARLOW d.1770 without issue
4 Alice BLAYNEY 
4 Joyous (Joyce) BLAYNEY d. unmarried
4 Elizabeth BLAYNEY
+ Lumley WILLIAMS Esq of Maen Meifod
5 Two sons, two daughters, all without issue
4 Jane BLAYNEY
+ Mr Baldwin of Shewsbury 
5Rev Blayney BALDWIN b~1706 dsp.1743 (age 36) (Croft)  , 
+ ?Jane b~1707 d.1770 
5 son dsp
5 dau. dsp
4 Bridget BLAYNEY m.1712 d.1744
+ John THOMAS of Aston
5 William THOMAS b.1713 dsp
5 Bridgett THOMAS b.1714 dsp
5 John THOMAS 1717
5 Juliana THOMAS b.1721
+Rev Sir Thomas EDWARDS
4 Margaret BLAYNEY bpt.21Jan1677 d. without issue
+ Curtis GAMBOLD Esq of Ross, Ireland
4 John (Johannes) BLAYNEY ?d.y. bur 28Feb1680 (Tregynog) 
4 Blandina BLAYNEY b.1680 d.1682 (Tregynon) 
4 John BLAYNEY Esq. of Gregynog b.1680 (bpt.25Apr1683 ); d.1752  or d.1720 
Only son to reach adulthood. 
Sheriff of Montgommeryshire 1715 [389a]
+ Anne WEAVER b~1681/2; m.29Oct1707; d.1751. Anne (Anna) was daughter of
Mary d.1709 and Arthur (Anthony) WEAVER Esq., D.D. of Morvil (Morille), Salop, d.1710
Armiger (knight) 1708, Sheriff of Montgomeryshire 1667 , with a Thomas Blayney
She brought the Morville estate in Shropshire into the Blayney family.
None of their children married  p35
5 Anna Marie(Maria) BLAYNEY b.24Oct1708 Tregynon dsp 1909; bur.2May1709 (Tregynon)
5 Anna (Anne) BLAYNEY bpt.29Sep1709 Tregynon ; bur.1726 (St. Mary's, Shrewsbury)
5 Edward BLAYNEY b.4May1710; bpt.Jan1710 Tregynon dsp.1715; bur.14Sep1715
5 Arabella BLAYNEY b.20Mar1712 dsp.1729; bur.12Mar1729 St. Mary's, Shrewsbury
5 Joyce (Joyous) BLAYNEY b.23Apr1713 dsp.28Dec1759
5 John BLAYNEY b.12Aug1714; bpt.4Jul1714 dsp bur.29Nov1714
5 Diana BLAYNEY bpt.14Jan1715 dsp.27Jul1780 (Salop)
5 Arthur BLAYNEY Esq b.11Feb1716; bpt.21Feb1716 dsp.01Oct1795 (unm)
Last Blayney Gregynog heir
High Sheriff of Montgomeryshire 1764  and ?1776.
See Arthur Blayney page.
Left all his property to his cousin Susannah (Susan) WEAVER (d.Nov1783),
dau of Anthony WEAVER of Morville (brother of Anne WEAVER).
Susan was married to Hon. Viscount Henry TRACY (b.25Jan1732/3;
the 8th Viscount of Rathcoole, responsible for a tablet commemorating
the Blayneys in the Tregynon church .
The Gregynog and Morville estates then passed through their daughter
Henrietta Susanna Tracy (b30Nov1776; d.5Jun1839) and her husband
Charles Hanbury, later Hanbury-Tracy, 1st Lord Sudeley of Toddington
(b.28Dec1777; m.29Dec1798; d.10Feb1858) .
5 John BLAYNEY bpt.1718 dsp ?
5 Frances BLAYNEY bpt.1719; dsp.7May1774
4 Ann (Anne or Anna) BLAYNEY bpt.24Jun1684 
+ Thomas MOORE (MORE) of More, Bishop's Castle, Shropshire (at Lydham) ;
m.28Mar1711 (Lydham) .
3 Arthur BLAYNEY b~1645
Tregynon Village, Montgomeryshire
Third son of Sir Arthur 
+(1)Mary (Margaret) FORBES (or FOSTER ) m<1667
4 Juliana (?=Jane below) BLAYNEY bpt.16May1667 (Tregynon)
4 Edward BLAYNEY bpt.5Apr1674 (Tregynon)
[Possibly a shoemaker  but
recent evidence  however, suggests that Edward
"entered the army and died unmarried in the field of battle".
4 Richard BLAYNEY
Occ.: "in trade"; dsp.1708 
[previously thought to be a candidate to be Richard, the father of
Thomas BLAYNEY the wheelwright -see Origin 3]
4 Henry BLAYNEY
Entered the army and died unmarried fighting under the Command of the Duke of Marlborough 
4 Jane BLAYNEY
4 Elizabeth BLAYNEY
+(2)Jane SMOTHERGILL (?from Belturbet, Co Cavan)
4 ?Henry BLAINE  See [Arthur.html#Comment2]
4 four other children , , , 
3 Elizabeth BLAYNEY 
2 ?? John BLAYNEY
Previously incorrectly listed here. Now listed on the Howell page
2 Anne BLAYNEY b.1605 m.1628 (before 1627); dsp.18Oct1634 = Lady BALFOUR.
+ Sir James BALFOUR, b<1583; created on 6Jul1619 1st Lord Balfour, Baron of Glenawly
Co. Fermanagh [Ireland]; d.18Oct1634 (London)
2nd son of Sir James BALFOUR of Pittendriech and Margaret BALFOUR.
James was twice previously married, 1st to Grissell (Grisold), dau & heir of Patrick BALFOUR,
and had 3 sons & 3 daughters, then 2ndly to Lady Elizabeth HAY, dau of George, the
6th Earl of Erroll. 
Through her marriage, she became Baroness BALFOUR.
A dispute arose between Balfour and Annne's cousin Robert Blayney who
was accused of abusing Anne ,
while Anne's marriage was both a relationship and finacial failure and she was
herself accussed of adultery by her elderly husband resulting in a very public
2 Jane BLAYNEY b.~1606 (CastleBlayney)
d.1689; bur 19Sep1689 (St Patricks, Dublin)
+(1)Sir James MOORE b~1609; d.27Feb1639, of Ardee Co Louth,
4th son of Gerald (Garrett) MOORE, Viscount Drogheda (b~1560; d.1627)
and brother of Rt Honourable Jane MOORE, married to Henry BLAYNEY, 2nd Lord Blayney
3 Anne MOORE d. young (Ardee) 
3 Jane MOORE d. young (Ardee) 
3 Robert d.unm 1677 
3 Lawrence d.unm 
3 Edward d.unm 
3 Ellen d.unm 
3 Alice MOORE [some genealogies say she d. young  (Ardee) but not all 
+ Darcy WENTWORTH Esq
4 Alice WENTWORTH
+(2)Lieut.-Col. Sir Robert STIRLING (STERLING) m.1642 d.10Jun1661
Governor of Cork and Major-General of Munster
[so Jane became Lady STIRLING]
3 "Several children" 
whereas Lodge's Peerage of Ireland state
"she had no issue by him".
2 Mary BLAYNEY b.1607, d. unm
2 Elizabeth BLAYNEY b.1608 d. unm <1627
2 ?Andrew BLAYNEY [error, moved to Andrew son of Lewis Blayney.
2 Martha BLAYNEY b.1610 
+ Walter COPE of Drumilly, Armagh, Ireland d>1657
Son & heir of Richard and Anne COPE of Ballyblitoge, co Monaghan
Grandson of Sir Anthony Cope, MP, 1st Baronet of Hanwell and Lady Frances Lytton
Walter was previously m. Abigail MOIGNE (d/oThomas MOIGNE, Bishop of Kilmore)
3 Walter COPE of Drumilly, Loughgall Co. d.1680
3 William COPE of Icombe
3 Sarah COPE
3 Robert COPE
3 Richard COPE of Sydon, co. Meath b.1658; Heir; d>1699
2 Lettice BLAYNEY b.1612
+ Colonel John O'NEIL Colonel of the Fews 
Son of Henry and grandson of Sir John Tirlogh O'Neill
3 Henry O'NEIL d.unm
3 Lucy O'NEIL d.unm
3 Owen JOHNSON, Esq., alias MacShane
+ Frances FAY 
4 [descended to Sir W.G JOHNSON, Baronet of Twickenham]
2 Richard ELLIS (foster son) 
3 Two daughters
Comment 1: Sir Arthur (Lt Col) Blayney of Shien Castle [aka Sir Arthur Blaney and Sir Arthur Blaenay] was Knighted for bravery at the English Civil War Battle of Beaumaris (01Oct1648), the last battle of the English Civil War which, by the way, was won by the Roundheads.
"Sir Arthur Blaney and his troop charged in the back lands, and was dangerously wounded in the arm, his elbow shattered to pieces" . He had commanded Royalist Welsh regiments at First Newbury battle of 20Sep1643. The Tregynon Blayney monument states he "served the Royall Martyr K.C. the first in the post of Coll. of Horse".
He assisted Sir William Owen of Brogyntyn, the Governor, in the defence of Harlech Castle for King Charles I.
He was one of the Commissioners appointed by the King to sign the articles of surrender of the castle of 13th March 1647.
It is interesting that The song "Men of Harlech" has become an unofficial Welsh national anthem.
Arthur was Sheriff of Montgomeryshire 1644. He was the son of Edward (who became the 1st Lord Blayney). He married Joyce (1st cousin once removed) the daughter of his cousin John Blayney and moved from Shien Castle, Monaghan, Ireland to Gregynog, Wales. Some histories give his name as Anthony , , but I suspect that this is likely to be based on the misprint in the ROWLEY-MORRIS "The Family of Blayney" paper ["Misprint of Sir Anthony for Sir Arthur" - Errata ]. See his genealogy above. He was also named as "Sir Hugh Blayney, Knight" in a Mostyn Collection MS.'s description of the events of 13th March 1647 , and "Sir Hugh Blaeney, Kt" in a MS. at Peniarth 
Comment 2: Henry - "No reason can be found for the black-listing of a member of so loyal a family as the Blayneys of Gregynog in the extensive purge of 1680, when 25 Welsh magistrates were ejected.." . This tells us that this Henry was (until purged), a magistrate.
However, it would seem that it was religion, not politics which determined which Justices of the Peace were appointed or removed (the "Purge of Recusants"). Henry Blayney was removed on 24th June 1680, re-appointed on 11th April 1681 and again removed on 29th November 1681 .
Comment 3: Elizabeth Skrysher born 1644 was dau of John Skrysher (1600 -1667) of Norbury, Staffordshire, England and Elizabeth Watkins d.1644. John was son of James Skrymsher, Esq., Of Norbury Manor, Staffordshire (1543 - 1619) and Elizabeth Collier d.1594. James was son of John Skrymsher, of Norbury Manor and Aqualate (1514-1569) and Dorothy Talbot (~1527-1570/71) of Shavinghead, Shopshire [direct ancestors of the current Queen -see below]. This John was in turn son of Thomas Skrymsher, Esq (1490-1551) and Mary (Joan) (Swineshead) Swynshed (~1500-1540/41) of Swynshed, Staffordshire, England. Thomas was the son of Sir William Skrymsher b.1458 in North Dighton, Yorkshire, England and Alice Witherington b~1468. 
As well as being the great-grandather of Elizabeth, John Skrymsher (1514-1569) is the 11th Great grandfather of Elizabeth II, Queen Of England (b.1926) 
Comment 4: The Monaghan estate:
"Early title deeds and leases, 1610-1666, relating to the lands in the Barony of Dartrey (mainly in the parish of Currin) Co. Monaghan acquired by Sir Robert Forth from Art oge MacMahon, are testimony to the conveyance of the land from the Gael to the Planter.....
The estate devolved from the original grant by the crown of lands in Co. Monaghan to Sir Edward Blayney as shown here in the early deeds. There is a certified copy of letters patent of 10 July 8 James I.  to Sir Edward Blayney of the lands of Corretober and other denominations in the Barony of Dartrey, Co. Monaghan. A conveyance of 4 May 1622 shows that Blayney, tenant-in-chief to the Crown, had left the native proprietors, mainly the McMahons, in possession and that they subsequently sold out to incomers. The conveyance ..... of the "towne village hamlett half tate or parcell of land" called Cornemucklagh, Co. Monaghan, in as large a manner as it was granted to Sir Edward Blayney, Kt." .
Comment 5: Blaney:
Blaney is towards the west of Fermanagh, on the southern shore of Lower Lough Erne. Lying close to Derrygonnelly, Blaney is not a heavily populated area but enjoys some beautiful scenery . "The area takes its name from Sir Edward Blaney [sic], Lord Deputy to King James I, who was among the English advance party sent to Fermanagh to organise the Plantation". This statement from Livingston's history of Fermanagh turns out to be incorrect, the area actually taking its name from thte Irish word "Bléan", meaning a "creek". Blaney Bay, on Lough Erne was a good location for prospective settlers, thus Tully Castle was founded by Sir John Hume in 1619. When it was sacked in the Irish Rebellion of 1641 by Rory Maguire, the family seat was replaced nearby with Castle Hume Hall designed by Richard Cassels .
Comment 6: The following description of how Sir Edward Blayney earned his knighthood is transcribed from Lodge's Peerage of Ireland, word for word except for
Numbered Footnotes now go 1-3, †, ‡ & Þ (instead of each page 1-3)
Previous symbol Footnotes are left out (too much detail) and
The use of �f� instead of �s� in spelling is removed for ease of reading. I left thew F on the word �Fiants� as this is an abbreviation of "Fiant litterae patentes" [Let letters patent be made], ie warrants to the Court of Chancery in Ireland.
�Sir Edward Blayney, the third son, was employed, from his youth, in the armies of Q. Elizabeth in Spain, Ireland and the low Countries, and by his valour and conduct raised himself to the degree of a Colonel. � He accompanied Robert, Baron, Earl of Essex into this Kingdom, when, in 1598 he undertook the reduction of the Northern rebels, commanding an old company of 100 men; ¹ but little or nothing being effected, and that unhappy Earl leaving his charge in September 1599, Captain Blayney was garrisoned at Newry with 150 foot,² and the Lord Mountjoy, a more experienced general, being sent over to prosecute the war, landed 26 February following, and 17 May 1600 detached Captain Blayney with 500 foot and 50 horse, to secure the March of the Earl of Southampton, and Sir Oliver Lambert, with recruits, to his camp beyond Newry, through the pass of the Moyry. He marched through the pass to the Faghard, where he left his foot in two divisions, and proceeding with the horse to Dundalk, informed the Earl of his errand; assuring him farther, that the Lord Deputy, with the rest of the army, would meet him by two o'Clock, at the causeway beyond the Pace. Hereupon the Earl marched to the Faghard, whence Captain Blayney, commanding the Van-Guard, advanced towards the Four-mile-Water, within half a mile of which he discovered the Irish on both fides in the wood, and when within musquet shot, perceiving 200 foot most advantageously posted beyond the water, he so disposed his men, and charged the enemy (with the assistance of the Lord Deputy's Van-Guard, then seasonably come up) that they were repulsed, the Earl's passage secured, and the whole army brought safe to Newry.
The fort of Mount-Norris being built by the L. D., and finished 9 November 1600 (being so called in honour of Sir John Norris, under whom he had learned the art of war, and therefore called, his Master) Captain Blayney was left governor thereof with 400 foot; and, 6 April 1601, the L. D. was advertised from Newry, that he and Captain Josias Bodley had burnt and destroyed the island of Loghrorcan, which the rebels had made their magazine.
� On 10 October, that year, he arrived at the memorable siege of Kingsale, and (the 24) was sent, with Captain Flower, from the camp at Knock-Robin with 500 foot, upon discovery that the Spaniards were drawn out of the town, in order to lie ready to receive them, had they approached that quarter, which they did not. ³ And, it being resolved in council (1 December) that some foot should be drawn out to brave the Spaniards; to view whether the breach made against Kingsale was assaultable, and to cause the enemy to shew themselves, that the artillery might the better play upon them, Sir John Berkeley and he, at the head of 2000 foot, were presently drawn near the walls of the town, and entertained a very hot skirmish with the Spaniards, who had entrenched themselves close to the breach without the town: but after an hour's fight, when a full view was taken of the breach, and that it was found not assaultable, the men were drawn off with little or no hurt; and that night, with Sir John Berkeley, and Captain Bodley, he drew out 25 of every company, and cast up a small fort on a hill, to the west of the town, to serve as a second to the artillery, that was to be planted not far from it. †
His gallant behaviour, during this siege, obtained him the honour of Knighthood; and after it was ended, he was dispatched from Dublin by the deputy, 20 October 1602, with a commission to govern the garrisons of Ruske and Monaghan ; to dispose of his government of Mount-Norris to Captain Atherton ; to supply those garrisons well with provisions; to deliver letters to Sir Arthur Chichester, with whom he was to concur in the intended service for those parts; to know from Mac-Mahon his absolute answer, whether he would submit upon the conditions sent him; which if he refused, to protect him no longer, but prosecute
him presently by all means ; to give O Connor Roe Maguire his best assistance, to establish him in his country; and to entertain the offers of such of Tyrone's captains, as were willing to forsake him and serve the Queen, and either to draw them from him, or make any use of their offers, and treat with them, as in his discretion he should think fit.‡
These services to the crown, Q. Elizabeth did not live long enough to requite, but he met with an ample recompence from her successor K. James I.; who being truly sensible of, and reposing especial trust and confidence in his approved loyalty, discretion, valour, and circumspection, which he had manifested by many faithful and commendable services, performed both to that Queen and himself (as the King writes in his letters from Westminster 23 July 1604) constituted him 13 December 1604 seneschal of the county of Monaghan, with the fee of ten shillings a day, (in which he was continued by K. Charles I.) made L. L. of the county; and for the furtherance of his Majesty's service there, had a lease 26 January 1606 of the castle of Monaghan, with the town and lands thereto allotted, for the term of 21 years, if he lived so long, and was not in the mean time moved from that government, and preferred to some place of better profit and command, paying the yearly rent of 3l. Irish money. � In K. James's Parliaments of 1613, and 1615 he was Knight for the county of Monaghan; in which last year (20 May) being then of the privy council, he was appointed one of the council for the government of the province of Munster; and 8 July 1615, he was rated 100 marcs to the Þ subsidy then granted; 24 September 1616 he was commissioned with the L. D. St. John, and others, for the plantation of Ulster, viz. to make and give warrants to the Attorney or Solicitor General, to draw books or fiants of grants of the several proportions and parcels of the escheated lands unto such British undertakers, as were named in the several tables of assignation, which books or fiants, were to be sufficient and immediate warrants to the Lord Chancellor, to pass the said grants under the great seal : it appears from the military list, that he then commanded 50 foot, at 10 shillings a day. And the King taking his merits and services into consideration, was pleased by privy seal, dated at Westminster 24 January 1620, and by patent at Dublin 29 July 1621, to create him Lord Blayney, Baron of Monaghan, in the county of Monaghan.�
Comment 7: "The King (Charles I) thus expressed himself:
[transcribed from Lodge's Peerage of Ireland with �s� replacing old �f� spelling]
"As honours and advancements have in all ages been the reward of virtuous men, so we do not find them at any time better placed, than upon such as were well experienced in military affairs, for to them the commonwealth is doubly indebted, as they are excellent ornaments to it in peace, and strong assistance in the time of war. Having therefore taken into our gracious consideration, how worthily our trusty and well-beloved Sir Edward Blayney, Knt., hath deserved of us in both kinds, being as able a counsellor since the peace, as he was a valiant soldier during the troubles of that kingdom, we are pleased, as a recompence of his merits, to make him a Baron of that our realm. These are therefore, &c. (Ròt. A. 19 Jac. I. 1. p. d.) "
Comment 8: Loftus Descent to Queen Elizabeth II:
Anne's father, Adam Loftus (Archbishop of Armagh and Dublin, Lord Chancellor of Ireland) was descended from both Edward I, Edward III and Henry III through his mother [Alice (Anne) Dudley (previously, Sutton) ]. He was the 10th Great grandfather of Queen Elizabeth II:
Adam Loftus (1533-1605) + Jane Purdon
Isabella Loftus (d.1597) + Sir William Ussher
Arthur Ussher (c.1588-1628) + Judith Newcomen
Sir William Ussher (c.1610-1671) + Ursula St. Barbe
Mary Ussher + Henry Colley
Richard Colley Wesley, 1st Baron Mornington (1690-1758) + Elizabeth Sale
Garret Wesley (1st Earl of Mornington, 1735-1781) + Anne Hill
Richard Wellesley, 1st Marquess Wellesley (1760-1842) + Hyacinthe-Gabrielle Roland
[Richard's brother was Arthur Wellesley 1st Duke of Wellington]
Anne Wellesley (1788-1875) + William Cavendish-Bentinck
Rev. Charles Cavendish-Bentinck (1817-1865) + Caroline Louisa Burnaby (1832-1918)
Nina Cecilia Cavendish-Bentinck (1862-1938) + Claude Bowes-Lyon, 14th Earl of Strathmore & Kinghorne
Lady Elizabeth Bowes-Lyon, The Queen Mother (1900-2002) + King George VI (1895-1952)