Y Blaidd Rydd Cyllyn 
He had a biological son named Cynillin ap Y Blaidd.
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Children
Cynillin ap Y Blaidd Rydd
Cynillin ap Y Blaidd was born about 1000. Cynillin ap Y Blaidd is no longer alive.
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Y Blaidd Rydd Cyllyn Cynillin ap Y Blaidd Rydd