The Abbasid Caliphate - Abbasid Dynasty (5 Phases of The Dinasty)

the history of the Abbasid Caliphate - Abbasid Empire - Abbasid Dynasty, one of the longest ruling empire in the history of mankind. Ruling vast region of the world in three continents: Europe, Africa, and Asia, shaping advance civilization in science, knowledge, art, and technology, with high respected leaders, military army, and scholars