page_title: William I, Count of Hainaut
section_title: Family
hierarchical_section_title: William I, Count of Hainaut / Family
caption_attribution_description: English: William I of Hainaut Čeština: Vilém I. z Hainaultu - pečeť
context_page_description: William the Good was count of Hainaut, Avesnes, Holland, and Zeeland from 1304 to his death.
context_section_description: On 19 May 1305 William married Joan of Valois, sister of the future king Philip VI of France, and had the following children:
  William II, Count of Hainaut (1307–1345)
  John (died 1316)
  Margaret II, Countess of Hainault (1311–1356), married Louis IV, Holy Roman Emperor
  Philippa of Hainault (c.1313–1369), 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)
  Jan Aelman (1320–1389) Illegitimate son and Knight
caption: Seals of William I
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