Pope Innocent IV, born Sinibaldo Fieschi was pope from June 28, 1243 to December 7, 1254.

Born in Manarola, he belonged to a feudal family of Liguria, the Fieschi, counts of Lavagna. He was educated at Parma and Bologna. He was considered one of the best canonists of his time.

His immediate predecessor was Pope Celestine IV, who however, was pope for eighteen days only, and therefore the events of Innocent IV's pontificate practically link themselves onto those of the reign of Pope Gregory IX (1227-41).

Innocent IV was elected unanimously at the conclave in Anagni (June 25, 1243). Frederick II, who had been excommunicated by Innocent's predecessor, is said to have remarked that he had lost the friendship of a cardinal and gained the enmity of a Pope; the letter which he wrote, however, expressed in respectful terms the hope that an amicable settlement of the differences between the empire and the papacy might be reached. The negotiation which shortly afterwards began with this objective proved abortive, Frederick II being unable to make the absolute submission to the Pope's demands which was required of him. The main point of dispute was the reinstatement of the Papal rights in Lombardy.

Finding his position in Rome insecure, Innocent IV secretly withdrew in the summer of 1244 to Genoa, and thence to Lyon, where he summoned a general council which met in 1245. The council did not see the presence of delegates from the whole Europe, the bishops present being mostly Spanish and French. Frederick II's position was defended by Taddeo of Suessa, who was however unable to prevent his deposition on July 17. The agitation caused by this act throughout Europe terminated only with Frederick II's death in December 1250, which permitted the Pope to return, first to Perugia, where he remained in 1251-1253, and afterwards to Rome.

In 1245, Innocent IV issued bulls and sent an envoy in the person of John of Plano Carpini (accompanied by Benedict the Pole) to the "Emperor of the Tartars". The message asked the Mongol ruler to become a Christian and stop his aggression against Europe. The Khan Güyük replied in 1246 a letter written in Persian that still rests in the Vatican Library, demanding the submission of the Pope and the other rulers of Europe.

In 1245 Innocent had sent another mission, through another route, led by Ascelin of Lombardia, also bearing letters. The mission met with the Mongol ruler Eljigidei near the Caspian Sea in 1247. The reply of Eljigidei was in accordance with that of Güyük, but it was accompanied by Mongolian envoys to Rome. They met with Innocent IV in 1248, who again appealed to the Mongols to stop their killing of Christians.

The remainder of his life was largely directed to schemes for compassing the overthrow of Manfred, the natural son of Frederick II, whom the towns and the nobility had for the most part received as his father's successor. Innocent aimed to incorporate the whole Kingdom of Sicily into the Papal States, but he lacked the necessary economical and political power. Therefore, after a failed agreement with Charles of Anjou, he invested that kingdom to Edmund, the nine year old son of Henry III of England (May 14, 1254). In the same year he excommunicated Frederick II's other son, Conrad IV, King of Germany, but the latter died a few days after the investiture of Edmund. Innocent therefore moved to Anagni to wait for Manfred's reaction to the event, especially as Conrad's heir, Conradin, had been entrusted to the Papal tutorage by the King's testament. Manfred submitted, although probably only to gain time and counter the menace from Edmund, and received the title of Papal vicar for southern Italy. Innocent could therefore live a period in which he was the effective sovereign of most of the peninsula, and on October 27 1254 he celebrated the feat by entering the city of Naples.

However, Manfred had not lost his time and organized a resistance, supported by his faithful Saracen troops, setting riots against the new authority. It was on a sick bed at Naples that Innocent IV heard of Manfred's victory at Foggia against the Papal forces: the tidings are said to have precipitated his death on December 7, 1254, in Naples.

His learning gave to the world an Apparatus in quinque libros decretalium. But he also issued the papal bull Ad exstirpanda acknowledging the right of the state to punish heretics after they were convicted of heresy.

He was succeeded by Pope Alexander IV (1254-61). Innocent was also the uncle of Adrian V (1276).

*Original text from the 9th edition (1880) of an unnamed encyclopedia. *

*Catholic Encyclopedia: "Pope Innocent IV"