GISLEBERT or GILBERT OF MONS (c. 1150-'1225), Flemish chronicler, was provost of the churches of St. Germanus at Mons and St. Alban at Namur. In official documents he is de scribed as chaplain, chancellor or notary, of Baldwin V., count of Hainaut (d. 1195), who employed him on important business. After 1200 Gislebert wrote the Chronicon Hanoniense, a history of Hainaut and the neighbouring lands from about 1050 to 1195, which is specially valuable for the latter part of the i 2th century, and for the life and times of Baldwin V.
See W. Meyer, Das Werk des Kanzlers Gislebert von Mons als ver fassungsgeschichtliche Quelle (Konigsberg, 1888) ; K. Huygens, Sur la valeur historique de la chronique Gislebert de Mons (Ghent, 1889) ; and W. Wattenbach, Deutschlands Geschichtsquellen, Band ii. •