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Male William de Grandeson Click to view William de Grandeson in the family tree

William was born in Cassington, Oxfordshire, England or near Lake Neufchatel,Switzerland.  William's father was Pierre I de Grandison and his mother was Agnes de Neuchatel.  His paternal grandparents were Ebal IV de Grandison and Beatrice de Genevre; his maternal grandparents were Ulric III de Neuchatel and Yolande de Urach Arberg. He had a brother named Amedee.  He died on June 27th, 1335 in Gascony, France.


William's family with Sybil de Tregoz

‌William and Sybil were married in a religious ceremony about 1285 in Donyatt, Somersetshire, England.  They had two sons and three daughters, named Piers, John, Agnes, Mabilia and Katherine.

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