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

William was born in Helmsley, Yorkshire, England.1   William's father was Robert "Furfan" de Roos and his mother was Isabella Avenal.  His paternal grandparents were Everard de Roos and Roysia Trusbut; his maternal grandparents were William I the Lion King of Scotland and Isabel Avenal.  He was an only child.  He died about 1264 in Kirkham, England.1 

Family Details of William's family with Lucia FitzPiers

1 large-G675.FTW
Further sources/citations:
Garner, Lorraine Ann "Lori", Ancestral Roots of Certain American Colonists Who Came to America bef 1760 @ line 170 p 148

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