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Male William Brus Click to view William Brus in the family tree

William was born about 1248 in Of, Annandale, Dumfriesshire, Scotland.1   William's father was Robert "The Competitor" Brus and his mother was Isabel De Clare.  His paternal grandparents were Robert De Bruce and Isabelle Huntingdon; his maternal grandfather was Gilbert De Clare. He had three brothers and three sisters, named Robert De, Bernard, Richard De, Isabella, Alosia and Christiana.  He was the third oldest of the seven children.1 

Family Details of William's family with Elizabeth De Sully

Family Details of William's family with Constance De Morleyn

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609