Cynfyn ap GWERYSTAN 
Cynfyn ap was born in 0978 in Powys, Wales. Cynfyn ap's father was Gwyrstan ap GWAETHFOED and his mother was Nesta verch CADELL. His paternal grandparents were Gwaethfoed ap GWYNNAN and Cadell ap BROCHWEL. He was an only child.
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.