Iorwerth Ap Owain, son of Owain Ap Gruffydd and Gwladus Verch Llywarch.
Born 1145 at Aberffraw Castle, Aberffraw, Anglsy, Wales, died 1184 at Aberffraw Castle, Anglesey, Wales, 38 or 39 years
Married 1163 at Aberffraw, Anglesey, Wales (20 or 21 years married) to:
Margred Verch Madog, daughter of Madog Ap Maredydd and Susanna Verch Gruffydd.
Born 1129 at ,, Montgomeryshire, Wales, died 1198 at Y, 68 or 69 years