WORLD HISTORY

Detailed explanation-1: -The quarrel was taken up by Ibrahim’s brother Abdallah, known by the name of Abu al-’Abbas as-Saffah, who defeated the Umayyads in 750 in the battle near the Great Zab and was subsequently proclaimed caliph .

Detailed explanation-2: -defeat of Umayyad dynasty 744–750), was defeated at the Battle of the Great Zab River (750). Members of the Umayyad house were hunted down and killed, but one of the survivors, ʿAbd al-Raḥmān, escaped and established himself as a Muslim ruler in Spain (756), founding the dynasty of the Umayyads in Córdoba.

Detailed explanation-3: -The Abbasids overthrew the Umayyad dynasty in 750 CE, supporting the mawali, or non-Arab Muslims, by moving the capital to Baghdad in 762 CE. The Persian bureaucracy slowly replaced the old Arab aristocracy as the Abbasids established the new positions of vizier and emir to delegate their central authority.

Detailed explanation-4: -Loss to the ʿAbbasids Seeing the weaknesses of the Umayyads, they declared a revolt in 747. With the help of a coalition of Persians, Iraqis, and Shīʿites, they put an end to the Umayyad dynasty with a victory against them at the Battle of the Great Zab River in 750.