Baldwin was son of Count
Baldwin II of Hainaut and
Ida of Louvain. He succeeded to the
County of Hainaut in 1102. Baldwin married Yolande of Guelders at a young age. He had been
betrothed to Adelaide of
Maurienne, a niece of Countess
Clemence of Flanders. The broken betrothal caused a scandal, and Countess Clemence brought the issue before her brother
Pope Calixtus II. The pope declared that the marriage was legal and could not be dissolved. Baldwin died at a young age of in 1120, and was buried in
Mons, Belgium. His eldest son,
Baldwin IV, succeeded him. His younger son Gerard inherited the counties of
Dodewaard and Dale, which had been in the possession of his mother. Countess Yolande held Hainaut as her
dower for a while and as a regent for her son. ==Family==