Despite being an imperial supporter in the Investiture Controversy, he built up his diocese by acquisitions (e.g. of Waremme[4] in 1078, Donceel[5]). Internally he operated as guardian of the Peace of God from 1081,[6] and instituted a court system.[7]
Geary, Patrick J., ed. (2010). Readings in Medieval History (4th ed.). University of Toronto Press.
Gislebertus (2005). Chronicle of Hainaut. Translated by Napran, Laura. The Boydell Press.
Robinson, I. S. (1999). Henry IV of Germany 1056-1106. Cambridge University Press.
H. Vanderlinden, Le tribunal de la paix de Henri de Verdun (1082) et la transformation de la principauté de Liège, in Mélanges Henri Pirenne (1926), 2:589–96.