william iii, count of hainaut

William III of Avesnes (1286 - June 7 1337) was count of Hainaut and Holland from 1304 to his death, succeeding his father, John II. He married Joanna of Valois, sister of king Philip VI of France, in 1305 and 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)
Joanna of Hainaut (1315-1374), married William V, Duke of Jlich
Isabelle of Hainaut (1323-1361), married Robert of Namur
Louis (1325-1328)

See also: Counts of Hainaut family tree

width="30%" align="center" rowspan="2" \| Preceded by: John II	width="40%" align="center" \| Count of Hainaut	width="30%" align="center" rowspan="2" \| Succeeded by: William IV
width="40%" align="center" \| Count of Holland

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