The Abbasid army consisted primarily of Khorasanians and was led by an Iranian general, Abu Muslim Khorasani. It contained both Iranian and Arab elements, and the Abbasids enjoyed both Iranian and Arab support. The Abbasids overthrew the Umayyads in 750. According to Amir Arjomand, the Abbasid Revolution essentially marked the end of the Arab empire and the beginning of a more inclusive, multi-ethnic state in the Middle East.