Otbert of Liège
He was a close supporter of Emperor Henry IV, accompanying him on campaigns.
In 1096 he took the whole Duchy of Godfrey of Bouillon as a pledge, for a sum of 1300 marks. He also bought the château de Couvin from Baldwin II, Count of Hainaut. At the same time he prevailed in a conflict over the comté de Brugeron, with Godfrey I of Leuven
- Gertrud Thoma (1993). "Otbert, Bischof von Lüttich". In Bautz, Traugott. Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German). 6. Herzberg: Bautz. cols. 1132–1333. ISBN 3-88309-044-1.
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