*Gwenllian I verch Owain
born about 1124 Caernarvonshire, Wales

father:
*Owain "Fawr" ap Gruffydd Prince of Gwynedd
born about 1087 Caernarvonshire, Wales
died December 1169 Caernarvonshire, Wales
buried Bangor Cathedral, Is Gwyrfai, Caernarvonshire, Wales

mother:
*Gwladus verch Llywarch
born about 1098 Arwystli, Montgomeryshire, Wales
married about 1125

siblings:
*Iorwerth "Drwyndwn" ap Owain born 1145? Aberffraw Castle, Aberffraw, Anglsy, Wales
died about 1184
*Cynan ap Owain born about 1140? Caernarvonshire, Wales died 1173
Rhirid ap Owain born about 1132 Caernarvonshire, Wales
Einion ap Owain born about 1144 Caernarvonshire, Wales
Madog ap Owain born about 1142 Caernarvonshire, Wales
Cynwrig I ap Owain born about 1145 Caernarvonshire, Wales died after 1165
Cadell ap Owain born about 1143 Caernarvonshire, Wales
Maelgwn ap Owain born about 1126 Caernarvonshire, Wales died afert 1174

spouse:
*Cadwgon ap Madog
born about 1138 Nannau, Llanfachreth, Merionethshire, Wales

children (from above union):
*Madog ap Cadwgon
born about 1150 Nannau, Llanfachreth, Merionethshire, Wales

spouse:
*Owain "Cyfeiliog" ap Gruffudd
born about 1117 Montgomeryshire, Wales
died 1197

children:
*Gwenwynwyn ap Owain born about 1151 Montgomeryshire, Wales died 1216
*Meddefus verch Owain born about 1163 Cyfeiliog, Montgomeryshire, Wales

biographical and/or anecdotal:

notes or source:
LDS