William I, Count of Hainaut

William the Good
Count of Hainaut, Holland, and Zeeland
16th-century depiction
Bornc. 1286
Died(1337-06-07)7 June 1337
Valenciennes
Noble familyHouse of Avesnes
Spouse(s)Joan of Valois
IssueWilliam II, Count of Hainaut
Margaret II, Countess of Hainaut
Philippa, Queen of England
Joanna, Duchess of Jülich
Isabella of Hainaut
FatherJohn II, Count of Hainaut
MotherPhilippa of Luxembourg

William the Good (Dutch: Willem, French: Guillaume; c. 1286 – 7 June 1337) was count of Hainaut (as William I), Avesnes, Holland (as William III), and Zeeland (as William II) from 1304 to his death.