He was the younger son of Baldwin VI , Count of Flanders and Richilde , of unknown origin .
Baldwin II of Mons ( 1056 -- 1098 ? ) was count of Hainaut from 1071 to his death .
Baldwin II of Mons was the younger Baldwin II of Mons of Baldwin VI , Count of Flanders and Richilde , of unknown origin .
Baldwin II of Mons ( 1056 -- 1098 ? ) was count of Hainaut from 1071 to his death .