William was the son of Philip Fychan ap Gwilym and Maud de Barry. The date and place of his birth have not been found.
His wife was Catrin verch Hwyel. They were married, but the date and place have not been found. They had no known children.
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Philip Fychan ap Gwilym |
Gwilym ap Jenkin |
Jenkin ap Adam |
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Gwenlian verch Aron |
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Gwenllian verch Hywel |
Hywel Fychan ap Hywel |
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Alice verch Llewellyn |
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Thomas de la Barre |
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Hopkin ap Hwyel Fychan |
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Gwenllian verch Rhys Foel |