Pope Innocent IV (Latin: Innocentius IV; c. 1195 – 7 December 1254), born Sinibaldo Fieschi, was Pope of the Catholic Church from 25 June 1243 to his death in 1254.
Born in Genoa (although some sources say Manarola) in an unknown year, Sinibaldo was the son of Beatrice Grillo and Ugo Fieschi, Count of Lavagna. The Fieschi were a noble merchant family of Liguria. Sinibaldo received his education at the universities of Parma and Bologna and, for a time, taught canon law at Bologna. It is pointed out by Agostino Paravicini-Bagliani, however, that there is no documentary evidence of such a professorship. From 1216-1227 he was Canon of the Cathedral of Parma. He was considered one of the best canonists of his time, and was called to serve Pope Honorius III in the Roman Curia as Auditor causarum, from 11 November 1226 to 30 May 1227. He was then promoted to the office of Vice-Chancellor of the Holy Roman Church (from 31 May to 23 September 1227), though he retained the office and the title for a time after he was named Cardinal.
Pope Innocent III (Latin: Innocentius III; 1160 or 1161 – 16 July 1216) reigned from 8 January 1198 to his death. His birth name was Lotario dei Conti di Segni, sometimes anglicised to Lothar of Segni.
Pope Innocent was one of the most powerful and influential popes. He exerted a wide influence over the Christian regimes of Europe, claiming supremacy over all of Europe's kings. Pope Innocent was central in supporting the Catholic Church's reforms of ecclesiastical affairs through his decretals and the Fourth Lateran Council. This resulted in a considerable refinement of Western canon law. Pope Innocent is notable for using interdict and other censures to compel princes to obey his decisions, although these measures were not uniformly successful. Innocent called for Christian crusades against Muslim Spain and the Holy Land, as well as the Albigensian Crusade against the Cathars in southern France.
One of Pope Innocent's most critical decisions was organizing the Fourth Crusade. Originally intended to attack Jerusalem through Egypt, a series of unforeseen circumstances led the crusaders to Constantinople, where they ultimately attacked and sacked the city (1204). Innocent reluctantly accepted this result, seeing it as the will of God to reunite the Latin and Orthodox Churches, but it poisoned relations between the two churches.
Pope Innocent may refer to: