Adelaide van Holland
- Marriage: John d’Avesnes 160
- Died: Abt 1284 160
 Noted events in her life were:
• Background Information. 160
John I d'Avesnes, Count of Hainaut and Holland was born 1 May 1218 and died 24 Dec 1257. John married 9 Oct 1246, Adelaide of Holland, Countess of Holland who died about 1284 and the daughter of Florent, Count of Holland and Mechtild of Brabant, daughter of Henry I, Duke of Brabant, by Mathilde of Boulogne.
~Weis' Ancestral Roots of Certain American Colonists Who Came to America before 1700, 8th Edition, 168:30, 100:28-29
• Web Reference: Aleide of Holland.
Adelaide von Holland was a daughter of Floris IV, Count of Holland and Matilda of Brabant. She was also a sister of William II, Count of Holland and King of Germany.
Adelaide married John d’Avesnes, son of Bouchard d’Avesnes and Marguerite comtessa de Hainault et Flandres.160 (John d’Avesnes was born in Oizy, Namur, Flanders and died in 1256 in Holland 160.)
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