Rhiwallon Ap Cynfyn

Rhiwallon Ap was born about 1025 in Of Powys,Wales.  Rhiwallon Ap's father was Cynfyn Ap Gwerystan and his mother was Angharad Verch Maredydd.  His maternal grandfather was Maredudd ap Owain. He had a half-brother named Griffith ap.

They had a daughter named Gwladus Verch Rhiwallon Ap.