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John of Ferentino, in Italian Giovanni da Ferentino (c. 1150 – 1217), was an Italian notary, curialist and cardinal of the Catholic Church. He served as the cardinal deacon of Santa Maria in Via Lata from 1204 until 1212 and then as the cardinal priest of Santa Prassede until his death. He served as an apostolic legate to England in 1206 and as rector of the Papal states in Campania in 1217.