The administration of Abbasids caliphate : a fateful change in the muslim history

The period of Abbasids was started in 750 A.D after the fall of Ummayads. Abu al Abbas alsafah was the first abbasi caliph. The period of Haroon Rasheed and Mamoon Rasheed was considered the golden period of Abbasids. In this period Abbasi caliphate contributed a lot for education, science, literature and fine arts. In this era many inventions were made. In short, it can be concluded that it was a golden era of Abbasids, which brought a fateful change in the Muslim History.