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Male William Sinclair , 1st Lord of Rosslyn Click to view William Sinclair , 1st Lord of Rosslyn in the family tree

William was born about 1028 in St Clair-sur-Elle, Manche, Normandy, France.  William's father was Mauger Seigneur de St. Clair and his mother was Miss St. Clair de Bassenville.  His paternal grandparents were Richard II "The Good" Duke of Normandy and Judith of Brittany. He had a brother named Walderne de.  He was the younger of the two children.  He died in 1078 in Killed by English in Northumberland, England.

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