William I (or in
Occitan:
Guilhem I) was the founder of the dynasty which bears his name: the Guilhems,
Lords of Montpellier. He received his fief (a
manor) of
Monspestularius (
Montpellier) on 26 November 986 from Bernard, Count of Mauguio, with the permission of Ricuin, Bishop of Maguelone.