The last remaining member of the previous dynasty, Abdur-Rahman III, took power in Andalus, and early leaders of this dynasty included Abu Muslim, al-Ma'mun, and al-Mansur.
The general Abu 'Awn commanded an army for this dynasty whichÂ was victoriousÂ at the Battle of the Great Zaab. Al-Mahdi, a leader of this dynasty was responsible for the massacre at Fakhkh, and the most notable ruler of this dynasty began a period dominated by the Barmecides. The Buyids took their capital and Al-Mu'tasim employed the use of Turkish mercenaries. The last remaining member of the previous dynasty, Abdur-Rahman III, took power in Andalus, and early leaders of this dynasty included Abu Muslim, al-Ma'mun, and al-Mansur. Noted for the expansion of the "Round City" of Baghdad under such caliphs as Harun ar-Rashid, for 10 points, name this dynasty which succeeded the Umayyads.Â  
The general Abu 'Awn commanded an army for this dynasty whichÂ was victoriousÂ at the Battle of the Great Zaab.
'Abbasids or 'Abbasiyuun 