After 250 years of Arab control, Sicily was inhabited by a mix of Christians, Arab Muslims, and Muslim converts at the time of its conquest by the Normans. Arab Sicily had a thriving trade network with the Mediterranean world, and was known in the Arab world as a luxurious and decadent place. It had originally been under the rule of the Aghlabids and then the Fatimids, but in 948 the Kalbids wrested control of the island and held it until 1053. During the 1010s and 1020s, a series of succession crises paved the way for interference by the Zirids of Ifriqiya. Sicily was racked by turmoil as petty fiefdoms battled each other for supremacy. Into this, the Normans under Robert Guiscard and his younger brother Roger Bosso came intending to conquer; the pope had conferred on Robert the title of "Duke of Sicily", encouraging him to seize Sicily from the Saracens.