Sir William of England, Knt., Count of Boulogne and Mortain

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Sir William of England, Knt., Count of Boulogne and Mortain, son of Stephen of Blois, King of England and Maud of Boulogne, was born between 1132 and 1137.1 He died October 1159,1 and was buried at Poitou, France.1

William married Isabelle de Warenne, Countess of Surrey, daughter of William de Warenne, 3rd Earl of Surrey and Ela of Ponthieu.1
This person was last edited on23 Aug 2019


  1. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 5:304-7 (Warenne 7), further cited as Richardson, Royal Ancestry.