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
Kingdom of Sicily as frankly exploitative. Furthermore, many scholars believe that Sicily went into decline in the late Middle Ages, though they are not agreed on when this decline occurred. Clifford Backman argues that it is a mistake to see the economic history of Sicily in terms of victimization, and contends that the decline really began in the second part of the reign of Frederick III, in contrast to earlier scholars who believed that Sicilian decline had set in earlier. Where earlier scholars saw late medieval Sicily in continuous decline, Stephen Epstein argued that Sicilian society experienced something of a revival in the