William I (or in Occitan language, Occitan: Guilhem I) was the founder of a dynasty which bears his name, the Guilhems, Lords of Montpellier. He received his fief (a Lord of the Manor, manor) of ''Monspestularius'' (Montpellier) on 26 November 985 from Bernard, Count of Mauguio, with the permission of Ricuin, Bishop of Maguelone. Without descendants after his death, his nephew Guilhem II of Montpellier succeeded him.

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