John I of Avesnes
- Born: 1 May 1218
- Marriage: Adelaide of Holland in 1246
- Died: 24 Dec 1257 at age 39
 General Notes:
Born: 1 May 1218
Marriage: Adelaide of Holland in 1246
Died: 24 Dec 1257 at age 39
General Notes:
John I of Avesnes was count of Hainaut from 1246 to his death. John was son of Countess Margaret II of Flanders and Hainaut as Margaret I, by her first husband, Count Bouchard IV of Avesnes. He inherited Hainaut, during Margaret's lifetime, while his half brother Guy of Dampierre became Count of Flanders.
Noted events in his life were:
• Acceded: count of Hainaut, 1246.
John married Adelaide of Holland in 1246. (Adelaide of Holland was born circa 1222 and died in 1284.)
Marriage Notes:
Their children were: John II, Count of Hainaut and Holland (1237-1304); Joanna, abbess of Flines (died 1304); Bouchard, Bishop of Metz (1251-1296); Guy, Bishop of Utrecht (1253-1317); William, Bishop of Cambrai (1254-1296); Floris, stadholder of Zeeland and Prince of Achaea (1255-1297).
John married Adelaide of Holland in 1246. (Adelaide of Holland was born about 1222 and died in 1284.)
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