The Annales Hanoniæ name "Lambertus…comes Lovaniensis" as son of "Rignerii comitis Montensis". The Gesta Episcorum Cameracensium records that "Rainerus atque Lantbertus, filii…Raineri", who had been banished by "archiepiscopus Bruno", returned to their father's lands after the death of Emperor Otto I and besieged "super Hagnam fluvium castrum Bussud", but that Emperor Otto II ordered their exile again. The Annales Leodienses, Floressienses et Marchianenses record that "Raginerus et Lantbertus" (sons of Reginar [III] Comte de Hainaut) returned from exile in 973 and killed "Guarnero et Rainaldo", who occupied their father's county, "apud Perronam" and besieged "super Hagnam fluvium castello Buxude". Thietmar records that "Lantbertus, Reinherii filius…cum fratre…Reingerio" killed "Wirinharium et eius germanum Reinzonem". Sigebert's Chronica records that in 977 "filii Ragineri" were "in terra partum suorum relocati", which presumably marked the beginning of their rehabilitation.
He established himself as LAMBERT [I] "le Barbu" Comte de Louvain. He is named "comite Lovaniæ Lantberto" in a charter dated 1003. The Annales Colonienses specify that "Lambertus comes" returned to favour with Heinrich II King of Germany in 1007.
The Gesta Episcoporum Cameracensium records the death in battle of "Lantbertus comes" at Florennes. "Lantbertum comitem, filium Ragineri Longicolli" is named in the Gesta of Gembloux Abbey when recording his death in battle at Florennes against "Godefridum ducem", although the reference to "Ragineri Longicolli" is anachronistic. 2
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