| In the days of Umayyads, their capital was Damascus and in the days of Abbasids, their permanent seat was in Baghdad. |
| Under the Abbasids, Baghdad became the capital and the center of political power and culture in the Middle East. |
| Its political unity had been disrupted soon after the victory of the Abbasids. |
| The Damascus-based Umayyads were overthrown by a revolution that brought the new dynasty of the Abbasids to power. |
| In 750 the Umayyad caliphate in Damascus was overthrown by the Abbasids. |
| Early Umayyad caliphs and some of the Abbasids who supplanted them employed the title khalifat Allah. |
