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Lietbertus of Saint-Ruf was the abbot of Saint-Ruf, in the diocese of Avignon, from 1100 to 1110.[1]
Letbert was the author of a commentary on the Psalms called Flores Psalmorum.[2] He also wrote the customs for or of Saint-Ruf (the Liber ecclesiastici et canonici ordinis). These customs were based upon the monastic recommendations of Saint Augustine, and were a great influence on other houses of regular canons which would become the Augustinian Order.[3][4]
Letbert was educated at the collegiate church of Saint Peter in Lille, which was dedicated in 1066 - hence his other cognomen, Letbert of Lille.
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