Cynfyn ap GWERYSTAN & Angharad verch MAREDUDD 
They had a son named Rhiwallon ap.
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Children
Rhiwallon ap CYNFYN
Rhiwallon ap was born in 1025 in Powys, Wales. He died at the age of 45 in 1070 in Slain in battle Mechain, Montgomeryshire, Wales.