As was the case in other areas occupied by Muslims, it was acceptable in Islamic marital law for a Muslim male to marry Christian and Jewish females in southern Italy when under Islamic rule – namely, the Emirate of Sicily, and, of least importance, the short-lived Emirate of Bari between the 8th and 11th centuries. In this case, most intermarriages were between Arab and Berber males from North Africa and the local Greek, Roman and Italian females. Such intermarriages were particularly common in the Emirate of Sicily, where one writer visiting the place in the 970s expressed shock at how common it was in rural areas. After the Norman conquest of southern Italy, all Muslim citizens (whether foreign, native or mixed) of the Kingdom of Sicily were known as "Moors". After a brief period when the Arab-Norman culture had flourished under the reign of Roger II of Sicily, later the mainlander Italians migrated to Sicily persecuted the Muslims of Sicily and they killed many of them; later the remnants were expelled in 1239 with the persecution of Frederick II, who deported the Muslim survivors in Lucera.