Deus Existo Domus

Search by name
Search birthplace
Search location of death
Search notes
Sign In
Become a Citizen
Royal Post

Count Hainaut William I de Avesnes
21 generations from the origin. Great x 19 grandfather.

Birth: 1286, Hainault, Belgium;
Death: Jun 7, 1337; Valenciennes, France;
Age: 51

Is this person your ancestor? If so, you should join the House Empire and work to earn your own noble or royal title. You could be added to this website showing this person as your ancestor! It's FREE! Click here to get started.

  • Count of Hainaut - Dates: 1304-1337
  • Count of Holland - Dates: 1304-1337
  • Count of Zeeland - Dates: 1304-1337


William III of Avesnes (1286 – June 7, 1337) was Count William I of Hainaut, Count William III of Holland and Count William II of Zeeland from 1304 to his death, succeeding his father, John II. Before becoming count, he was defeated by Guy of Namur at the battle on the island of Duiveland in 1304. Guy and Duke John II of Brabant then conquered most of Zeeland and Holland, but these territories were recovered again when William became the new count in the same year. William continued the war with Flanders until the peace of Paris in 1323, where the Count of Flanders denounced all claims on Zeeland.

William had occupied most of the bishopric of Utrecht and tried to conquer Friesland. Many of his daughters married with important rulers of Europe and he was called the father in law of Europe. The King of England and the Holy Roman Emperor were married to his daughters, while he was married to the sister of the King of France. William tried to gain support of surrounding counties and duchies for an anti-French coalition.

Internally, William restored order and founded new institutions, like the treasury and the chancellory. The council of the count got more responsibilities.

Some or all of the above information was taken from To read more, click here.




See the Family Tree

Count of Hainaut John II de Avesnes
1247 - Aug 22, 1304
Countess of Hainaut Philippina de Luxembourg
1252 - Apr 6, 1311
Primary or Last Marriage:
Date: May 19, 1305, Place: Aisen, France, Status: Marriage, Note:
Jeanne de Valois
c. 1294 - Mar 7, 1352
Queen Consort of England Philippa of Hainault
Great x 18 grandmother
c. 1314 - Aug 15, 1369
Design and content © 2011 House Empire, Inc.