William III the Good of Hainault
- Born: 1286
- Marriage: Jenne de Valois on 19 May 1305
- Died: 7 Jun 1337 at age 51
 General Notes:
Born: 1286
Marriage: Jeanne de Valois on 19 May 1305
Died: 7 Jun 1337 at age 51
Other names for William were William V and William III of Avesnes.
Noted events in his life were:
• Acceded: Count of Hainault & Holland, 1304.
William married Jeanne de Valois, daughter of Charles III de Valois and Margaret of Anjou, on 19 May 1305. (Jeanne de Valois was born circa 1294 and died on 7 Mar 1342.)
Marriage Notes:
William and Jeanne had the following children: - William IV of Hainaut (1307-1345); - John (died 1316); - Margaret II, Countess of Hainaut (1311-1356), married Louis IV Wittelsbach, Holy Roman Emperor; - Philippa of Hainault (1311-1369), married king Edward III of England; - Agnes (died 1327); - Joannaof Hainaut (1315-1374), married William V, Duke of Jülich; - Isabelle of Hainaut (1323-1361), married Robert of Namur; - Louis (1325-1328) .
William married Jenne de Valois, daughter of Charles III de Valois and Margaret of Anjou, on 19 May 1305. (Jenne de Valois was born about 1294 and died on 7 Mar 1342.)
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