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Baldwin IV, Count of Hainaut
|Died||(1171-11-08)8 November 1171|
|Noble family||House of Flanders|
|Spouse(s)||Alice of Namur|
|Father||Baldwin III, Count of Hainaut|
|Mother||Yolande de Wassenberg|
Baldwin IV (1108 – 8 November 1171) was count of Hainaut from 1120 to his death.
Baldwin IV was the son of Count Baldwin III of Hainaut and Yolande de Wassenberg.  Also known as Baldwin the Builder, he purchased the property of Ath in 1158 and built the Burbant tower. He ceded the locality of Braine-la-Willotte also known as Braine-le-Comte to the chapter of Sainte-Waudru in 1158. In 1159, he incorporated the seigniory of Chimay and in 1160, the châtellenies of Valencians and of Ostrevent.
- Yolande (1131–1202), married first to Ivo II, Count of Soissons, and second to Hugh IV, Count of St Pol
- Baldwin (1134–1147)
- Agnes (1142–1168), married Ralph I, Lord of Coucy and had issue including Yolande de Coucy, wife of Robert II, Count of Dreux.
- Geoffrey, Count of Ostervant (1147–1163), first husband of Eleanor, Countess of Vermandois
- Lauret(t)a (1150–1181), married first to Thierry of Alost, and second to Bouchard IV, Count of Montmorency
- Baldwin V (1150–1195), also count of Flanders by his marriage to Margaret I of Flanders.
- Gislebertus (of Mons), Chronicle of Hainaut, transl. Laura Napran, (The Boydell Press, 2005), 40.
- Detlev Schwennicke, Europäische Stammtafeln, New Series, Vol. XXVII, Tafel 32.
- Gislebertus (of Mons), Chronicle of Hainaut, 41.
- Gislebertus (of Mons), Chronicle of Hainaut, 42.
Baldwin IV, Count of HainautBorn: 1108 Died: 8 November 1171
| Count of Hainaut
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