William married Alix De Avesnes, [Countess of Nor in 1290. Alix (daughter of Jean Ii De Avesnes, [COUNT OF HOLLAN and Philippina (Philippa) Countess Luxembourg-Maas) was born about 1273 in Of, Valenciennes, Nord, France; died on 26 Oct 1317 in Sp. [Group Sheet] [Family Chart]