Yarthyr Mervyn
- Yes, date unknown
Generation: 1
Generation: 3
Generation: 4
1. Yarthyr Mervyn (son of Merfyn Ap Rhodre Mawr King of Powys); and died.
2. Merfyn Ap Rhodre Mawr King of Powys (son of Rhodri Mawr (The Great) Prince of Wales and Angharad); died in 900. Children:
- of Powys and died.
- Triffyn Mervyn and died.
- 1. Yarthyr Mervyn and died.
- Avandreg Mervyn and died.
- Llewelyn Ap Mervyn and died.
Generation: 3
4. Rhodri Mawr (The Great) Prince of Wales was born in 844 (son of Merfyn The Freckled King of Gwynedd and Nest); died in 878 in Battle. Rhodri + Angharad. (daughter of Meuric Ap Dynwal Ap Asthi Sitsllt Lord Caerdigan) and died. [Group Sheet] [Family Chart]
5. Angharad (daughter of Meuric Ap Dynwal Ap Asthi Sitsllt Lord Caerdigan); and died. Children:
- Cadell Ap Rhodre Mawr King of S. Wales died in 909.
- Son A Wales and died.
- Son B Wales and died.
- Son C Wales and died.
- Anarawd Ap Rhodri Mawr Prince of Gwynedd was born in 878; died in 916.
- 2. Merfyn Ap Rhodre Mawr King of Powys died in 900.
Generation: 4
8. Merfyn The Freckled King of Gwynedd (son of Gwriad of Man King of Gwynedd and Ethil Queen of Gwynedd); died in 844. Merfyn + Nest. (daughter of Cadwell Ap Brochwel of Powys) and died. [Group Sheet] [Family Chart]
9. Nest (daughter of Cadwell Ap Brochwel of Powys); and died. Children:
- 4. Rhodri Mawr (The Great) Prince of Wales was born in 844; died in 878 in Battle.
10. Meuric Ap Dynwal Ap Asthi Sitsllt Lord Caerdigan and died. Children:
- 5. Angharad and died.
- Gwgan Meuric Lord Caerdigan and died.