Nielsen Hayden genealogy
Gronwy ap Cynwrig ab Iorwerth ap Hwfa
Generation: 1
Generation: 2
Generation: 3
Generation: 4
1. Gronwy ap Cynwrig ab Iorwerth ap Hwfa Family/Spouse: Unknown. [Group Sheet] [Family Chart]
Children:
Generation: 2
2. Cynwrig ap Gronwy ap Cynwrig ab Iorwerth 
(1.Gronwy1)Family/Spouse: Alice ferch Robert Holland. [Group Sheet] [Family Chart]
Children:
- 3. Dafydd Llwyd was born in of Bwlch y fen, Anglesey, Wales.
- 3. Dafydd Llwyd
Generation: 3
3. Dafydd Llwyd (2.Cynwrig2, 1.Gronwy1) was born in of Bwlch y fen, Anglesey, Wales. Family/Spouse: Angharad ferch Gynffydd ap Tydyr. [Group Sheet] [Family Chart]
Children:
- 4. Dafydd Fychan ap Dafydd Llwyd ap Cynwrig was born in of Trefeilir in Malltraeth, Anglesey, Wales.
- 4. Dafydd Fychan ap Dafydd Llwyd ap Cynwrig
Generation: 4
4. Dafydd Fychan ap Dafydd Llwyd ap Cynwrig (3.Dafydd3, 2.Cynwrig2, 1.Gronwy1) was born in of Trefeilir in Malltraeth, Anglesey, Wales. Family/Spouse: Nest ferch Ieuan ap Gruffudd. Nest (daughter of Ieuan ap Gruffudd ap Hywel and Efa ferch Gruffudd ap Dafydd Goch ap Dafydd) was born in of Eifionydd, Caernarvonshire, Wales. [Group Sheet] [Family Chart]
Children:
- 5. Margred ferch Dafydd Vychan was born in of Trefeilir in Malltraeth, Anglesey, Wales.
- 5. Margred ferch Dafydd Vychan