He began his career in the Roman Curia as a Chaplain of Pope Innocent IV (1243-1254) and scriptor in the chancellery (attested in 1245) [REF].
Pope Nicholas III (Orsini) died on August 22, 1280, and Cardinal Bianchi participated in the Conclave which was held in Viterbo, beginning in September, 1280 [REF].