John I of Avesnes 1
- Born: 1 May 1218
- Marriage: Adelaide of Holland in 1246
- Died: 24 Dec 1257 aged 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, daughter of Florent IV de Holland and Mathilde de Brabant, 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).
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