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Birth:          1286 of Avesnes, Pas-de-Calais, France
Death:          7 Jun 1337 Valenciennes, Nord, France

Notes
https://en.wikipedia.org/wiki/William_I,_Count_of_Hainaut
William I, Count of Hainaut (c.?1286 – 7 June 1337), was Count William III of Avesnes, 
Count William III of Holland and Count William II of Zeeland from 1304 to his death.
Career[edit]

William, born c.? 1286, was the son of John II, Count of Hainaut, and Philippa of 
Luxembourg, daughter of Henry V of Luxembourg.[1] He was the brother of John of 
Beaumont and Alice of Hainault.

William was originally not expected to become count. After the deaths of his elder 
brothers, John (killed at Kortrijk in 1302) and Henry (d. 1303), he became heir to his 
father's counties.[1]

Prior to 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.[2] William continued the war with Flanders until the 
Peace of Paris in 1323, during which the Count of Flanders renounced all claims on 
Zeeland. William, in turn, gained all of Zeeland but agreed to renounce all claims on 
Imperial Flanders.[2] William had occupied most of the Bishopric of Utrecht and tried 
to conquer Friesland but was repelled by Hessel Martena. At the death of his uncle, 
Guy d'Avesnes, Bishop of Utrecht, William took his fief of Amsterdam and annexed it 
to Holland.[2]

Many of his daughters married with important rulers of Europe; King Edward III of 
England and Holy Roman Emperor Louis IV were married to his daughters, while he 
was married to the sister of the King Philip VI of France.[3] With these important 
alliances William gained considerable influence and respect which he used to 
advance the interests of his counties.[2]

Family[edit]

On 19 May 1305 William married Joan of Valois,[1] sister of the future king Philip VI of 
France,[4] and had the following children:
William II, Count of Hainaut (1307–1345)[1]
John (died 1316)[1]
Margaret II, Countess of Hainault (1311–1356), married Louis IV, Holy Roman Emperor
[1]
Philippa of Hainault (1312–1369), married King Edward III of England[1]
Agnes (died 1327)[1]
Joanna of Hainaut (1315–1374), married William V, Duke of Jόlich[1]
Isabelle of Hainaut (1323–1361), married Robert of Namur[1]
Louis (1325–1328)[1]
Jan Aelman (1320–1389) Knight

Parents
D'AVESNES Jean II (John II) (ABT 1247 - 22 Aug 1304)
DE LUXEMBOURG Philippa (ABT 1252 - 6 Apr 1311)

Siblings
D'AVESNES William (Willem) III (1286 - 7 Jun 1337)

Marriage To DE VALOIS Joan (Jeanne) (1294 - 7 Mar 1342)
    m. 1310 

Notes

Parents
OF VALOIS Charles I (12 Mar 1270 - 16 Dec 1325)
____ Margaret (Marguerite) (ABT 1273 - 31 Dec 1299)

Children by DE VALOIS Joan (Jeanne) 1294 - 7 Mar 1342
OF HAINAULT Philippa (24 Jun 1311 - 15 Aug 1369)

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