- William I, Count of Hainaut (1286 - 7 Jun 1337)
- William III, Count of Avesnes
- William III, Count of Holland
- William II, Count of Zeeland
John II, Count of Hainaut and Philippa of Luxembourg
- m. Jeanne de Valois (Joan of Valois) before 1311. Issue: 8:
- William II, Count of Hainaut (1307-1345)
- John (died 1316)
- Margaret II, Countess of Hainaut (1311-1356), married Louis IV, Holy Roman Emperor
- Philippa of Hainault (1311-1369), married King Edward III of England
- Agnes (died 1327)
- Joanna of Hainaut (1315-1374), married William V, Duke of Jülich
- Isabelle of Hainaut (1323-1361), married Robert of Namur
- Louis (1325-1328)
- 7 children with Trude Boudijnsdotter van de Poule and other mistresses
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No known carriers of William's Y-chromosome or his mother's mitochondrial DNA have taken yDNA or mtDNA tests.
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On May 7, 2015 at 10:44GMT John Atkinson wrote: