They were forced to cede authority over al-Andalus (current Spain and Portugal) to the Umayyads in 756, Morocco to the Idrisids in 788, Ifriqiya and Sicily to the Aghlabids in 800, Khorasan and Transoxiana to the Samanids and Persia to the Saffarids in the 870s, and Egypt to the Isma'ili- Shia caliphate of the Fatimids in 969. Despite this initial cooperation, the Abbasids of the late 8th century had alienated both non-Arab mawali (clients) and Persian bureaucrats. Persian customs were broadly adopted by the ruling elite, and they began patronage of artists and scholars. The Abbasid period was marked by dependence on Persian bureaucrats (such as the Barmakid family) for governing the territories as well as an increasing inclusion of non-Arab Muslims in the ummah (Muslim community). This, in addition to housing several key academic institutions, including the House of Wisdom, as well as a multiethnic and multi-religious environment, garnered it a worldwide reputation as the 'Center of Learning'. Baghdad became the center of science, culture and invention in what became known as the Golden Age of Islam. The Abbasid Caliphate first centered its government in Kufa, modern-day Iraq, but in 762 the caliph Al-Mansur founded the city of Baghdad, near the ancient Babylonian capital city of Babylon. They ruled as caliphs for most of the caliphate from their capital in Baghdad in modern-day Iraq, after having overthrown the Umayyad Caliphate in the Abbasid Revolution of 750 CE (132 AH). It was founded by a dynasty descended from the prophet's uncle, Abbas ibn Abdul-Muttalib (566–653 CE), from whom the dynasty takes its name. The Abbasid Caliphate ( / ə ˈ b æ s ɪ d/ or / ˈ æ b ə s ɪ d/ Arabic: الْخِلَافَةُ الْعَبَّاسِيَّة, al-Khilāfah al-Abbāsiyyah) was the third caliphate to succeed the Islamic prophet Muhammad.

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