Nielsen Hayden genealogy
Iorwerth ap Madog ap Gruffudd ab Owain Brogyntyn
Generation: 1
Generation: 2
Generation: 3
Generation: 4
1. Iorwerth ap Madog ap Gruffudd ab Owain Brogyntyn Notes:
Mentioned 1245.
Family/Spouse: Lleucu ferch Llywelyn ap Gruffudd. [Group Sheet] [Family Chart]
Children:
Generation: 2
2. Madog ab Iorwerth ap Madog ap Gruffudd 
(1.Iorwerth1)Notes:
Flourished 1293 and 1321.
Family/Spouse: Efa ferch Llywelyn ap Gruffudd. [Group Sheet] [Family Chart]
Children:
- 3. Gwerfyl ferch Madog was born in of Hendwr in Edeirnion, Merionethshire, Wales; died after 1293.
- 3. Gwerfyl ferch Madog
Generation: 3
3. Gwerfyl ferch Madog (2.Madog2, 1.Iorwerth1) was born in of Hendwr in Edeirnion, Merionethshire, Wales; died after 1293. Notes:
Also called Gwerful ferch Madog o'r Hendwr ab Iorwerth ap Madog ap Gruffudd ab Owain Brogyntyn ap Madog ap Maredudd ap Bleddyn ap Cynfyn.
Family/Spouse: Gronwy ap Tydyr Hên ap Gronwy. Gronwy (son of Tudur ap Gronwy ab Ednyfed Fychan ap Cynwrig and Angharad ferch Ithel Fychan ab Ithel Gam ap Hen Ithel Gam ap Maredudd ab Uchdrud ab Edwin) was born in of Penmynydd, Anglesey, Wales; died in 1331; was buried in Bangor, Gwynedd, Wales. [Group Sheet] [Family Chart]
Children:
- 4. Tudur ap Gronwy died in 1367 in Trecasteil, Anglesey, Wales.
- 4. Tudur ap Gronwy
Generation: 4
4. Tudur ap Gronwy (3.Gwerfyl3, 2.Madog2, 1.Iorwerth1) died in 1367 in Trecasteil, Anglesey, Wales. Notes:
Also called Tudur ap Gronwy ap Tudur ap Gronwy.
Family/Spouse: Margred ferch Thomas. Margred (daughter of Thomas ap Llewellyn ab Owain ap Maredudd and Elinor ferch Maredudd) was born in of Iscoed, Ceredigion, Wales. [Group Sheet] [Family Chart]
Children:
- 5. Maredudd ap Tudur died after 1406.
- 5. Maredudd ap Tudur