Theobald of Ostia (French: Thibaut de Vermandois or Thibaut de Nanteuil, Italian: Teodobaldo di Vermandois; died 4 November 1188) was a French cardinal.
He entered the Order of Benedictines of the Congregation of Cluny in his youth.
[1] In 1184 pope Lucius III named him Cardinal-Bishop of Ostia e Velletri; as such, he signed the papal bulls between 21 May 1184 and 29 October 1188.
Shortly before his death, pope appointed him legate in England, but he was unable to fulfill this mission.
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