abt 1055 – 04.1093
Father: Tewdwr ap Cadell of Seisyllwg
Mother: Gwenllian (Gladys) verch Gwyn of Dyfed
Married: Gwladys ferch Rhiwallon of Powys
Father: Rhiwallon ap Cynfyn of Powys † abt 1073
Mother: Faelis verch Llewlyn, abt 1027 – 1081
Child 01: Gryffydd ap Rhys of Seisyllwg, abt 1081 – 1137
Child 02: Hywel ap Rhys of Seisyllwg
Child 03: Goronwy ap Rhys of Seisyllwg
Child 04: Cadwgan ap Rhys of Seisyllwg
Child 05: Nesta verch Rhys of Seisyllwg, abt 1073 – 1130/6