Baldwin was the younger son of Count
Baldwin VI of Flanders and Countess
Richilde of Hainaut. He became
count of Hainaut after the death of his older brother,
Arnulf III of Flanders, at the
battle of Cassel. The
County of Flanders was then claimed by their victorious uncle
Robert the Frisian. During Baldwin's
minority reign, which lasted until 1083, Richilde constantly fought against Robert to recover Flanders for her son, but she was unsuccessful. In order to obtain funds, she
enfeoffed the county to the
Prince-Bishopric of Liège. With the funds obtained in the transaction, around 1072, she assembled a coalition that included the
duke of Bouillon, the counts of
Namur,
Louvain,
Montaigu,
Chiny, Hautmont (Clermont, according to Reiffenberg) and others, all to no avail: Robert defeated the coalition decisively at Broqueroie. ==Family==