The Chronicon Hanoniense names "primogenitus Balduinus…secundus Arnulphus" as sons of "Balduino comiti Hanoniensi". The Liber de Restauratione Sancti Martini Tornacensis names "filius eius [=Balduino]". Otbert Bishop of Liège declared having bought "castellum de Covino" from "comite Balduino de Mont", in the presence of "uxore ipsius Ida, cum filiis suis Baldewino, Arnulpho, Lodewico, Heinrico", by charter dated 14 Jun 1096.
He succeeded his father in 1098 as BAUDOUIN III Comte de Hainaut, minor until [1103]. A charter dated 1117 records the donation by "comite Balduino", with the consent of "uxore sua Iola et filio suo Balduino…prefati comites fratres Ernulfus et Willelmus", of "allodium de Oberceiis" to the abbey of Saint-Denis en Broqueroie, signed by "…Gossuinus Avesnensis et frater eius Isembardus…Arnulfus de Crois…".
The Chronicon Hanoniense records that "Balduinus comes Hanoniensis, Balduini comitis et Yde comitisse filius" was buried in the church of Mons. 1
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