 Complete the following phrase:  In 839 or 840, Raffadali was occupied by the Arabs, who introduced new crops, such as apricots, pears, pistachio, citrus fruits, and carob, as well as new farming techniques and a system of canals to irrigate the fields. One etymology for the towns name derives it from the Arabic Rahl-Afdal رحال افدال, meaning excellent village. Two centuries later, the 