This is a dense study of the biographical output of Sigebert of Gembloux, who is best known as the author of a popular world chronicle. It was written up to 1112 and, after Sigebert's death, several times expanded. Sigebert was born in about 1028 and as a young boy, probably an oblate, entered Gembloux. In about 1048 he moved as schoolmaster to St Vincent at Metz, but in 1072 for unknown reasons he returned to Gembloux, where he remained until his death in 1112. He wrote just sixteen biographical works, in prose and poetry, ranging from lives of abbots and bishops to saints. Licht's work is set out as a catalogue or register, listing for each of Sigebert's works their manuscripts, editions and modern studies. In the case of poetry Licht also includes a discussion of the author's mastery of versification. From Sigebert's time in Metz date his Life of Bishop Thierry i of Metz (d. 983), and various hagiographical pieces on the holy martyr Lucia, of which the Passio sanctae Luciae metrica is the most important on account of its innovative versification. This output was followed by the Life and miracles of King Sigebert iii (d. 656), the alleged founder of the monastery of St Stephen at Metz, after whom the author had been named. Before he left the city, Sigebert composed a Laus urbis on Metz which he included in Bishop Thierry's Life. Back at Gembloux he wrote about the martyrs of Theba and SS. Maclou and Wicbert. He also composed a house chronicle in the gesta genre: the deeds of the abbots of Gembloux (gesta abbatum Gemblacensium). Various other hagiographical works followed on SS. Lambert, Theodardus and Guibert. Amongst his later works, apart for the world chronicle, was his De viris illustribus, a list of important authors (ancient and medieval), a genre established by Suetonius and Hieronymus. In the introductory chapter (pp. 6–12) Tino Licht offers a useful analysis of Sigebert's handwriting in four manuscripts, now in Brussels, identified as written in Sigebert's hand by Dom Boutemy in the 1930s. All other so-called autographs should be rejected.