| | Llywelyn Fawr Aberffraw 1173–1240 Tangwystl ferch Llywarch …–… Joanna of England 1210–1236 | | |
| | Iowerth Drwyndwn Gwynedd 1130–1174 | | |
| | Owain Fawr Gwynedd 1087–1169 Gwladys ferch Llywarch …–… | | |
Gwenllian Gwunedd-Powys …–… | | |
| | Llywelyn Fawr Aberffraw 1173–1240 Tangwystl ferch Llywarch …–… Joanna of England 1210–1236 | | |
| | Iowerth Drwyndwn Gwynedd 1130–1174 | | |
| | Susanna verch Gruffydd 1095–… Madog Powys ap Maredydd …–… | | |
| | Gruffyd Gwunedd-Powys 1055–1136 Angharad verch Owain 1065–… | | |
| | Cynan Gwunedd-Powys 1014–1063 | | | | Maelcocre of Leinster 1000–… | | | | | | | | Olaf Sitricsson Dublin …–981 Gormlaith Leinster …–1030 | | |
| | | Brian Boru King of Ireland 940–1014 | | |
|
|
| | | Dunlaing King of Leinster …–… | | | | Tuathal King of Leinster 890–958 | | | | Ugaire King of Leinster 860–… | | |
|
|
|
|
|
|
| | | Iago Gwynedd Powys 974–1039 Afrandreg verch Gweir 984–… | | | | | | | | | | | | Afandreg verch Merfyn …–… | | |
|
|
|
|
| |
|
|
|