Ubaydallah Ibn Al-Sari
Ubaydallah ibn al-Sari ( ar, عبيد الله بن السري) (died 865) was a governor of Egypt from 822 until 826. A son of al-Sari ibn al-Hakam, he was the third and last member of his family to autonomously rule over parts of Egypt during the troubled period following the great Abbasid civil war, and his surrender to Abdallah ibn Tahir in 826 marked the re-imposition of firm Abbasid control over the province for the first time since the outbreak of the conflict. Career Ubaydallah was the son of al-Sari ibn al-Hakam, a member of the ''abna al-dawla'' who had served as governor of Egypt in 816 and 817–820. Following the death of al-Sari in 820 Ubaydallah was appointed as prefect of police by his brother Abu Nasr, who had assumed the governorship, and upon Abu Nasr's own death in 822 he was himself acclaimed as his successor and given the oath of allegiance by the army. As a result of the division of Egypt under his father, however, his effective jurisdiction extended on ...
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Abbasid Dinar - Al-Ma'mun - 208 AH (823 AD)
The Abbasid Caliphate ( or ; ar, الْخِلَافَةُ الْعَبَّاسِيَّة, ') was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abdul-Muttalib (566–653 CE), from whom the dynasty takes its name. 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). 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. Baghdad became the center of science, culture and invention in what became known as the Golden Age of Islam. 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 "C ...
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