Individual Page

Marriage: Children:
  1. Crisli Verch Iago: Birth: 983 in Gwynedd, Wales.

  2. Cynan Ap Iago: Birth: 1014 in Aberffraw, Malltraeth, Anglesey, Wales. Death: 1063 in Aberffraw, Castle, Anglsy

  3. Tangwystl Ferch Iago: Birth: Abt 1030 in Gwynedd Gwlad, Wales. Death: Aft 1075

1. Page:   Database online.
2. Page:   Graeme Wall, 28 Dec 2003
3. Page:   Wales01
4. Page:   p. 321, 322
5. Page:   vol. 1 p. 12, 41*; vol. 8 p. 604; vol. 9 p. 663
6. Page:   vol. 1 p. 72; vol. 4 p. 267*
7. Page:   vol. 2 p. 107*, 156, 190, 226, 255
8. Page:   p. 50
9. Page:   p. 36
10. Page:   p. 95
11. Page:   p. 38
12. Page:   p. 309, 324
13. Page:   book 5 p. E64*
14. Page:   p. 322
15. Page:   vol. 1 p. 41
16. Page:   vol. 4 p. 267
17. Title:
 Newsgroup: soc.genealogy.medieval, at groups -
 Burke's Guide to the Royal Family
 "A Gillette Genealogy" compiled by Donna Gillette Gellerman 1984
 Pedigrees of Anglesey and Carnarvonshire Families: with Their Collateral Branches in Denbighshire, Merionethshire
 Welsh Genealogies, AD 300-1400
 The History of the Princes, the Lords Marcher and the Ancient Nobility of Powys Fodog and the Ancient Lords of Arwystli, Cedewen and Meirionydd (1881-1887)
 Heraldic Visitations of Wales and Part of the Marches Between the Years 1586 and 1613 by Lewys Dwnn
 British Chronology
 British Genealogy (filmed 1950)
 Early Welsh Genealogical Tracts ["Hanes Gruffudd ap Cynan"] (MFU #4567)
 Early Welsh Genealogical Tracts ["Hanesyn Hen and Related Manuscripts"](MFU #4567)
 Early Welsh Genealogical Tracts ["Mostyn MS. 117"] (MFU #4567)

Page:   p. 309
Author:   Peter Barns-Graham, Chairman
 Griffith, John Edwards
 Bartrum, Peter C. (Peter Clement)
 Lloyd, Jacob Youde William
 Dwnn, Lewys; transcribed and edited with notes by Sir Samuel Rush Meyrick
 E. B. Fryde Greenway, S. Porter, and I. Roy
 Evans, Alcwyn Caryni
 Peter C. Bartrum
Publication:   Location:;
 Name: The Generations Network, Inc.; Location: Provo, UT, USA;
 Name: Burke's Peerage; Location: London; Date: c1973;
 Name: W.K. Morton; Location: Horncastle, England; Date: 1914;
 Name: 25 volumes, with supplements containing additions and corrections. [Wales]: University of Wales Press; Date: 1980;
 Name: 6 volumes. T. Richards; Location: London; Date: 1881-1887;
 Name: 2 volumes. Llandovery: William Rees; Date: 1846;
 Name: Offices of the Royal Historical Society. University College; Location: London; Date: 1986;
 Name: Books A to H. National Library of Wales manuscript numbers 12359-12360. Manuscript filmed by the Genealogical Society of Utah, 1950;
 Name: Cardiff. University of Wales Press; Date: 1966;
Address:   Family History Library (FHL) 35 North West Temple Street/Salt Lake City, Utah 8
AddressaddressLine1:   35 North West Temple Street/Salt Lake City, Utah 8
Givenname:   Family History Library (FHL)
Name:   Family History Library (FHL)
RepositoryId:   R1037
Addressname:   Family History Library (FHL)
Note:   Source Medium: Manuscript
  Manuscript provided by Dorothy J. Cowan, Oct. 2002

a. Note:   King of Gwynedd Brenin of Gwynedd RESEARCH NOTES: 1033-1039: Prince of Gwynedd [Ref: Tapsell Dynasties p178] King of Gwynedd, restored 1033 [Ref: Moncreiffe RoyalAnc p10] had skull cleft with axe by his own men in 1039 [Ref: Moncreiffe RoyalAnc p10] wife name given as Avendreg [Ref: Wurts MCBarons p435] "AP IDWAL"; PRINCE OF NORTH WALES; KING 1023-1039 ----------- Iago ab Idwal ap Meurig (died 1039) was a Prince of Gwynedd. On the death of Llywelyn ap Seisyll in 1023, the rule of Gwynedd returned to the ancient dynasty with the accession of Iago, who was a great-grandson of Idwal Foel. Very little is known about the reign of Iago. He was killed by his own men in 1039 and replaced by Llywelyn ap Seisyll's son, Gruffydd ap Llywelyn. Iago's grandson Gruffydd ap Cynan later won the throne of Gwynedd, and because his father, Cynan ap Iago, was little known in Wales, Gruffydd was styled "grandson of Iago" rather than the usual "son of Cynan". References * John Edward Lloyd (1911). A history of Wales: from the earliest times to the Edwardian conquest. Longmans, Green & Co. --------------------- Iago ab Idwal IAGO (AB IDWAL AB MEIRIG,) prince of North Wales from 1021 to 1031. On the death of Llywelyn ab Sitsyllt, lago seized possession of the sovereignty of North Wales as being the right heir thereof, and kept it until 1031, when he was slain in battle by Gruffydd the son of Llywelyn. He left a son called Cynan who carried on the war against Gruffydd, by his wife Avandred, daughter of Gweir the son of Pyll. (Welsh Chronicles. Myv. Arch. ii. 507.) [Ref: Rev. Robert Williams, _Enwogion Cymru, A Biographical Dictionary of Eminent Welshmen, Longman & Co., London (1852), p. 236] ***** IAGO ab IDWAL ap MEURIG (d. 1039), king of Gwynedd; a great grandson of Idwal Foel. After successive usurpations of legitimate authority in Gwynedd between 986 and 1033 (see Maredudd ap Owain, Llywelyn ap Seisyll, Rhydderch ap Iestyn) the old line was restored in the person of Iago. A brief rule of six years ended in his murder and replacement by Gruffudd ap Llywelyn ap Seisyll. His [Iago's] son, Cynan, was the father of Gruffydd ap Cynan who finally re-established the house of Rhodri the Great as the senior dynasty in North Wales. Source: J. E. Lloyd, _A History of Wales_, 1911 (last edn. 1930). T.J.P.* [Ref: The Dictionary of Welsh Biography Down to 1940, editors, Sir John Edward Lloyd & R. T. Jenkins, (1959), p. 408] Note: the insertion "[Iago's]" in the foregoing is mine...CH * Professor Thomas Jones Pierce, M.A., F.S.A., Aberystwyth, author of this article. ***** IAGO AB IDWAL AB MEIRIG (d. 1039), king of Gwynedd, was, probably on account of his tender years, thrust aside from the succession on the death of his father, Idwal ab Meirig, in 997. The usual struggle between rival claimants ensued, and among others, Llewelyn ab Seissyllt, who was not a member of the royal house, filled the throne for a period; but on his death, in 1023, Iago seized the sovereignty of Gwynedd, while that of Dyved fell to the bands of Rhydderch ab Iestyn (Brut y Tywysogion, p. 265). Iago gave refuge to Iestyn ab Gwrgant, who had violated Ardden, the daughter of Robert ab Seissyllt, and cousin of Grufydd ab Llewelyn ab Seissyllt. The latter thereupon attacked Iago and killed him after an obstinate battle in 1039. (Annales Cambri´┐Ż; Brut y Tywysogion; Gwentian Chron.) Gruffydd then placed himself on the throne occupied at an earlier date by his father, Llewelyn ab Seissyllt. [See authorities cited.] D. LL. T.* [Ref: DNB, Editor, Sidney Lee, MacMillan Co, London & Smith, Elder & Co., NY, 1908, vol. x, pp. 408] * D. Lleufer Thomas, author of this article. Regards, Curt BIBLIOGRAPHY: Baldwin, Stewart, Llywelyn ap Iorwerth ancestor table. Posting to soc.genealogy.medieval (email list GEN-MEDIEVAL) on 7/27/1997-062054. Subject: Llywelyn ap Iorwerth ancestor table, gen. 1-8, 9-13, 14-18. Available at,, and Author address: sbald at AUBURN dot CAMPUS dot MCI dot NET. Moncreiffe, Sir Ian of that Ilk, Royal Highness: Ancestors of the Royal Child. London: Hamish Hamilton, 1982. NYPL ARF 83-3293. Tapsell, R. F., Monarchs, Rulers, Dynasties and Kingdoms of the World. New York: Facts on File Publications, 1983. Wurts, John S., Magna Charta: The Pedigrees of the Barons, Philadelphia, PA: Brookfield Publishing Co, 1942.
b. Note:   BI106799
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