Benedictine monk and chronicler known for his Chronicon ab anno 381 ad 1113, a universal history widely used as a source by later medieval historians, and for his defense (1075) of Holy Roman Emperor Henry IV's role in the Investiture Controversy, the struggle between emperors and popes for control over the investiture of bishops.

After receiving his education at the monastery of Gembloux, Sigebert taught at the monastery at Metz from 1050 to 1070; during these years he began to write idealized biographies of the lives of saints. In 1070 he returned to Gembloux, where he continued to write and teach. Among his hagiographies are: Vita Wicberti (“The Life of Wicbert,” the founder of the monastery, who died in 962); Gesta abbatum Gemblacensium (“History of the Abbots of Gembloux” to 1048); Vita Sigiberti III, regis Austrasiorum (“The Life of Sigibert III of Austrasia,” a Merovingian king and saint who died in 656); and De viris illustribus (“Concerning Illustrious Men,” a survey of ecclesiastical historians, c. 1105). He also wrote a treatise (1103) in support of imperial investiture and against Pope Paschal II.