The papacy versus the House of Hohenstaufen The rising had its origin in the
struggle of investiture between the
pope and the
Hohenstaufen Holy Roman Emperors for control of
Italy, especially the Church's private
demesne known as the
Papal States. These lay between Hohenstaufen lands in northern Italy and the Hohenstaufen
Kingdom of Sicily in the south; the Hohenstaufens also, at the time, ruled Germany. In 1245
Pope Innocent IV excommunicated Frederick II and declared him deposed, and roused opposition against him in Germany and Italy. When Frederick died in 1250, his dominion was inherited by his son,
Conrad IV of Germany. A period of turmoil followed Conrad's death in 1254, and the Kingdom of Sicily was seized by
Manfred, King of Sicily, Frederick's illegitimate son, who reigned from 1258 to 1266. Manfred had no involvement in German politics, where the
interregnum lasted longer and there was no emperor until 1274. He first styled himself as vicar of his nephew
Conradin, Conrad's son. However, following a false rumor that Conradin was dead, Manfred had himself crowned king. He wished for a reconciliation with the papacy, which may have explained his support for the landless
Baldwin II, Latin Emperor. However,
Pope Urban IV and later
Pope Clement IV were not prepared to recognize Manfred as lawful ruler of Sicily and first excommunicated him, then sought to depose him by force of arms. After abortive attempts to enlist England as the champion of the Papacy against Manfred, Urban IV settled on the later
Charles I of Naples as his candidate for the Sicilian throne. Charles would invade Italy, and in 1266 defeated and killed Manfred at the
Battle of Benevento, becoming King of Sicily. In 1268 Conradin, who had meanwhile come of age, invaded Italy to press his claim to the throne, but he was defeated at the
Battle of Tagliacozzo and executed afterwards. Charles was now undisputed master of the Kingdom of Sicily.
Charles of Anjou and Sicilian unrest Charles regarded his Sicilian territories as a springboard for his Mediterranean ambitions, which included the overthrow of
Michael VIII Palaiologos of the
Byzantine Empire and the capture of
Constantinople. Constantinople was captured during the
Fourth Crusade and had been brought into the fold of the Roman Catholic religion for 57 years under the rule of the
Latin Empire. With the Byzantine
recapture of the city in 1261, Michael VIII Palaiologos continued to rebuild what was left of the economically strategic city as an important trade route to Europe. Unrest simmered in Sicily because of its very subordinate role in Charles' empire—its nobles had no share in the government of their own island and were not compensated by lucrative posts abroad, as were Charles' French, Provençal and Neapolitan subjects; also, Charles spent the
heavy taxes he imposed on wars outside Sicily, making Sicily somewhat of a donor economy to Charles' nascent empire. As
Steven Runciman put it, "[The Sicilians] saw themselves now being ruled to enable an alien tyrant make conquests from which they would have no benefit". The unrest was also fomented by Byzantine agents to thwart Charles' projected invasion and by King
Peter III of Aragon, Manfred's son-in-law, who saw his wife
Constance as rightful heir to the Sicilian throne. == The uprising ==