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Male Viscount William de Grandison Click to view Viscount William de Grandison in the family tree

William de was born about 1255 in ,Neuchâtel,Neuchâtel Canton,Switzerland.1   William de's father was Amadeus de Grandison.  His paternal grandparents were Pierre I ,sn de Grandson de Grandson and Agnes de Neufchatel.  He was an only child.  He died on June 27th, 1335 in Gascony,France.1 


William de's family with Sybil Tregoz

‌William de and Sybil were married in a religious ceremony in 1285 in Donyatt,Somersetshire,England.1   They had two sons and three daughters, named Peter de, John de, Mabilia de, Agnes de and Katherine.

1 "Genealogical Research of Kirk Larson"
2 {Larson: Genealogical Research of Kirk Larson}
Further source/citation:
"FamilySearch® Ancestral File™ v4.19"

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