Abt 1286 - 1337 (51 years)
Z --, Fasted I d'Oisy Family
| Earliest Ancestor(s) | Fasted I d'Oisy & Ada d'Avesnes |
| Origins | About 1093 |
| Descendants | 164 Descendants / 35 Generations. |
| Variant Spellings | d'Avêsnes, unknownperson |
Pedigree of William III d'Avêsnes, Count of Hainault and Holland
(6x Great Grandfather)
| | Fasted I d'Oisy | | Fasted II d'Oisy
& Richilde | | Walter I d'Oisy, Lord of Avêsnes and Leuze
& Ada of Mortagne | | Nicholas d'Avêsnes, Lord d'Avêsnes, Leuze and Conde
& Mathilda de la Roche | | Jacques d'Avêsnes, Seigneur d'Avêsnes, Leuze, Conde and Guise (b. Abt 1150)
& Adele de Guise (b. Before 1155, Guise, Aisne, Hauts-de-France, France) | | Sir Bouchard d'Avêsnes, Seigneur d'Avêsnes and d'Etroen (b. Abt 1180)
& Margaret, Countess of Hainault and Flanders (b. 2 Jun 1202, Constantinople (now Istanbul), Empire of the East) | | Jean I d'Avêsnes, Seigneur d'Avesnes (b. 1 May 1218, Étrœungt, Nord, Hauts-de-France, France)
& Adelaide of Holland (b. About 1225) | | Jean II d'Avêsnes, Count of Hainault and Holland (b. 1247, Brabant, Holland)
& Philippa of Luxemburg | | | William III d'Avêsnes, Count of Hainault and Holland (b. Abt 1286, Hainault, Belgium) |
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