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Male William III de Say , Lord of West Greenwich Click to view William III de Say , Lord of West Greenwich in the family tree

William III de was born before 1209 in West Greenwich, Kent, England.  William III de's father was Geoffrey II de Say , MCS, Lord of W. Greenwich and his mother was Alice de Chesney.  His paternal grandparents were Geoffrey I de Say , Lord of West Greeenwich and Alice Maminot , Heiress of West Greenwich; his maternal grandfather was John de Chesney.  He was an only child.


William III de's first family with Mary

‌William III de and Mary were married in a religious ceremony after 1250 in 1st husband 2nd wife.  They had a son and a daughter, named William IV de and Miss de.


William III de's second family with Sibyl Marshal

‌William III de and Sibyl were married in a religious ceremony in 1st wife.  They had a daughter named Agnes de.

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