*Gwladus Verch Llywarch
born Abt 1098 Of Arwystli, Montgomeryshire, Wales

*Llywarch Ap Trahaearn
born Abt 1070 Of Arwystli, Montgomeryshire, Wales
died 1128 North Wales

*Dyddgu Verch Iorwerth
born Abt 1060 Of Radnorshire, Wales

*Robert ap Llywarch born about 1100 Arwystli, Montgomeryshire, Wales died 1171
Iorwerth ap Llywarch born about 1104 Arwystli, Montgomeryshire, Wales died 1130
Maredudd ap Llywarch born about 1106 Arwystli, Montgomeryshire, Wales died 1129
Madog ap Llywarch born about 1108 Arwystli, Montgomeryshire, Wales died 1130
Elen verch Llywarch born about 1102 Arwystli, Montgomeryshire, Wales

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

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

biographical and/or anecdotal:
Some of these children may belong to Owain's second wife and vice versa.
notes or source: