Iago ab Idwal ap Meurig, King of Gwynedd1 
He succeeded as the King of Gwynedd in 1023.1
Child of Iago ab Idwal ap Meurig, King of Gwynedd
- [S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.
Cynan ab Iago
Child of Cynan ab Iago and Ragnaillt of Dublin
- Gruffydd ap Cynan, King of Gwynedd+ b. c 1055, d. 1137
- [S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.
Gruffydd ap Cynan, King of Gwynedd1 
He succeeded as the King of Gwynedd in 1081.1
Children of Gruffydd ap Cynan, King of Gwynedd and Angharad ferch Owain
- Cadwallon ap Gruffydd1 d. 1132
- Susanna ferch Gruffydd1
- Gwenllian ferch Gruffydd1
- Owain ap Gruffyd, King of Gwynedd+ b. c 1100, d. 28 Nov 1170
- Cadwaladr ap Gruffydd+1 b. c 1100, d. 1172
Owain ap Gruffyd, King of Gwynedd1 
He succeeded as the King of Gwynedd in 1137.1 He had allegedly by more wives several other children.2
Child of Owain ap Gruffyd, King of Gwynedd
- Hywel ap Owain, King of Gwynedd1 d. 1170
Child of Owain ap Gruffyd, King of Gwynedd and Angharad verch Peredur
- Cynan ap Owain3 d. 1173
Children of Owain ap Gruffyd, King of Gwynedd and Gwladus ferch Llywarch
Children of Owain ap Gruffyd, King of Gwynedd and Cristin ferch Goronwy
- Dafydd ap Owain, Prince of East Gwynnedd d. 1203
- Angharad verch Owain3
- Rhodri ap Owain+1 b. c 1135, d. 1195
Iorwerth ap Owain
He was also known as Iorwerth Drwyndwn (‘Crooked Nose’) ap Owen Gwynedd Gwynedd.1
Child of Iorwerth ap Owain and Margaret ap Madog
- Llywelyn ap Iorwerth, Prince of North Wales+ b. 1173, d. 1240
- [S37] BP2003 volume 3, page 4188. See link for full details for this source. Hereinafter cited as. [S37]
Gwladus ferch Llywarch1
Children of Gwladus ferch Llywarch and Owain ap Gruffyd, King of Gwynedd
Dafydd ap Owain, Prince of East Gwynnedd1 
- [S11] Alison Weir, Britain’s Royal Families: The Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 57. Hereinafter cited as Britain’s Royal Families.
- [S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.
- [S37] BP2003 volume 3, page 4188. See link for full details for this source. Hereinafter cited as. [S37]
Tangwystyl Goch
Children of Tangwystyl Goch and Llywelyn ap Iorwerth, Prince of North Wales
- Angharad ferch Llywelyn+
- Gruffydd ap Llywelyn+ b. 1200, d. 1 Mar 1244
Gruffydd ap Llywelyn 
Child of Gruffydd ap Llywelyn
Children of Gruffydd ap Llywelyn and Senena ferch Rhodri
- Owain Goch ap Gruffydd1 d. 1282
- Llywelyn ap Gruffydd, Prince of North Wales+ b. c 1223, d. 11 Dec 1282
- Rhodri ap Gruffydd+1 b. 1230, d. 1315
- Dafydd ap Gruffydd+1 b. 1238, d. 1283
- [S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.
- [S5162] Werner Kittel, “re: Normandy Families,” family provided evidence then verified by subsequent research and verification by BENR (101053), 4 February 2011. Hereinafter cited as “re: Normandy Families.”
- [S37] BP2003 volume 2, page 2792. See link for full details for this source. Hereinafter cited as. [S37]
Margaret ap Madog1
Child of Margaret ap Madog and Iorwerth ap Owain
- Llywelyn ap Iorwerth, Prince of North Wales+1 b. 1173, d. 1240
- [S112] Welsh Biography Online, online http://wbo.llgc.org.uk. Hereinafter cited as Welsh Biography Online.
- [S37] BP2003 volume 3, page 4188. See link for full details for this source. Hereinafter cited as. [S37]