Adelaide of Holland
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Adelaide of Holland (circa 1222 – 1284) was a daughter of Floris IV, Count of Holland and sister of William II, Count of Holland and King of Germany. In 1246, Adelaide married John I of Avesnes, Count of Hainaut and had the following issue:
- 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)
Between 1258 and 1263, Adelaide was regent of Holland in the name of her nephew Floris V. She died in 1284, but in 1299, with the death of Floris' son John I, it was her own son John II of Avesnes who inherited Holland through her.