Baldwin IV, Count of Hainaut

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Coats of Arms of the Counts of Hainaut.

Baldwin IV (1108 – November 8, 1171) was count of Hainaut from 1120 to his death. He was the son of Baldwin III, Count of Hainaut. 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 (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. Baldwin married Alice of Namur, heiress of Namur, and had the following issue:

Yolande (1131–1202), married Hugh IV, Count of St Pol
Baldwin (1134–1147)
Agnes (1142–1168)
Geoffrey, Count of Ostervant (1147–1163)
Lauretta (1150–1181), married Bouchard IV, Count of Montmorency
Baldwin V (1150–1195), also count of Flanders by his marriage to Margaret I of Flanders