Pyll Ap Cynan 
He had a biological son named Llywarch Holwbrwch Ap.
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Children
Llywarch Holwbrwch Ap Pyll
Llywarch Holwbrwch Ap was born about 1030. Llywarch Holwbrwch Ap is no longer alive.
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Pyll Ap Cynan Llywarch Holwbrwch Ap Pyll