*Iorwerth "Drwyndwn" Ap Owain
born 1145? Aberffraw Castle, Aberffraw, Anglsy, Wales
died about 1184

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 1126

siblings:
*Gwenllian I verch Owain born about 1124 Caernarvonshire, Wales
*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:
*Margred Verch Madog
born Abt 1129 Of Montgomeryshire, Wales
married Abt 1163

children:
*Llewelyn Ap Iorwerth
born 1173 Aberffraw Castle, Caernarvonshire, Wales
died 11 Apr 1240 Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales

biographical and/or anecdotal:

notes or source:
LDS