He gave himself up to the study of Roman law and canon law at Bologna, where he seems to have taught, and to have taken his degree "utriusque juris". He taught canon law at Paris, and spent some time in England, whence King Henry III sent him on a mission to Innocent IV.
Later he became Provost of Antibes, and chaplain to the pope and was soon promoted to the See of Sisteron (1244), afterwards to the Archdiocese of Embrun (1250). He became Cardinal-Bishop of Ostia and Velletri, 4 December, 1261, whence his name Hostiensis. His health forced him to leave the conclave which, after the Holy See had been vacant for three years, elected Gregory X (1271-1276).
As a canonist Hostiensis had a great reputation. His works are:
St.monica Holy Card
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