William was the son of sir William FitzWilliam and Isabel Deincourt. The date and place of his birth have not been found.
He died on 12 MAR 1322 in Pontefract castle, Wakefield, West Yorkshire, England .
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sir William FitzWilliam |
sir William FitzWilliam |
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Agnes de Grey |
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Isabel Deincourt |
sir Edmund Deincourt |
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Isabel de Mohun |
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| Event | Date | Details | Source | Multimedia | Notes | ||||
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| Death | 12 MAR 1322 |
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