Emirate of Sicily conquer Castrogiovanni (the modern Enna, where Euphemius died) and retreated back to Mazara. In 830 they received a strong reinforcement of 30,000 Ifriqiyan and Andalusian troops. The Iberian Muslims defeated the Byzantine commander Teodotus in July–August of that year, but again a plague forced them to return to Mazara and then to Ifriqiya. The Ifriqiyan units sent to besiege Palermo managed to capture it after a year long siege in September 831. Palermo became the Muslim capital of Sicily, renamed al-Madinah ("The City"). The conquest was a see-saw affair; with considerable resistance and many internal struggles, it took over a
Sicily of Benevento, which then occupied most of southern Italy. Rumors that the capital of the empire was to be moved to Syracuse probably cost Constans his life, as he was assassinated in 668. His son Constantine IV succeeded him, a brief usurpation in Sicily by Mezezius being quickly suppressed by the new emperor. Contemporary accounts report that the Greek language was widely spoken on the island during this period. In 740 Emperor Leo III the Isaurian transferred Sicily from the jurisdiction of the church of Rome to that of Constantinople, placing the island within the eastern church. In 826 Euphemius,