The Abbasids were an Arabic dynasty that initially ruled over most of the Islamic empire (save some western parts) after assuming the caliphate in 750 CE, later on, their empire fragmented, however, they retained spiritual supremacy as caliphs until 1258 CE. They assumed the caliphal title after ousting the ruling Umayyad Dynasty, hence serving as the second dynasty to serves as a Caliphate (632-1924 CE, intermittently).
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Definition
Timeline
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747 - 750Abbasid Revolution.
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750Death of Imam Ibrahim, the leader of the Abbasid clan - he was succeeded by his brother Abu Abbas.
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750 - 754Reign of Abu Abbas As-Saffah.
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750Fall of the Umayyad Caliphate.
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750Start of the Abbasid Caliphate.
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751Battle of Talas (Tang-Abbasid war; followed by amiable diplomatic relations).
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754 - 775Reign of Al-Mansur over the Abbasid Caliphate.
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755Death of Abu Muslim, the mastermind of the Abbasid revolution.
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756Abd al-Rahman I establishes the Emirate of Cordoba.
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756 - 788Reign of Abd al-Rahman I over the Emirate of Cordoba.
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775 - 785Reign of al-Mahdi.
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785 - 786The reign of al-Hadi.
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786 - 809The reign of Harun al-Rashid.
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800 - 909Aghlabids given autonomy over Ifriqya and western half of Sicily.
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806Harun al-Rashid's famous invasion into Byzantine territories.
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809 - 813Reign of al-Amin.
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813 - 833Reign of al-Ma'mun.
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833 - 842Reign of al-Mu'tasim.
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842 - 847Reign of al-Wathik.
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847 - 861Reign of al-Mutawakkil.
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861Al-Mutawakkil is killed in a palace coup instigated by his Turkish bodyguards.
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861 - 862Reign of al-Muntasir.
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909Fatimids overthrow the Aghlabids in Ifriqya.
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909 - 1171Fatimids rule as an anti-Caliphate to the Abbasids.
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945Buyids take possession of Baghdad.
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1055Seljuks oust the Buyids and take control of Baghdad.
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1092 - 1135Reign of al-Mustarshid; revival of military strength begins.
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1135Al-Mustarshid is killed by the Seljuks.
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1136 - 1160Reign of al-Muktafi; revival of military strength is completed.
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1157Seljuks besiege Baghdad but are unable to penetrate it.
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1171Saladin abolishes the Fatimid Caliphate.
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1174 - 1193Reign of Saladin, Sultan of Egypt and Syria, and founder of the Ayyubid dynasty.
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1225Death of al-Nasir, the last able Abbasid ruler.
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1250 - 1517Mamluk Sultanate.
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1258The Mongols conquer the Abbasid Caliphate. During this campaign there is the infamous sacking of Baghdad and murder of the caliph.
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1260Battle of Ain Jalut; Mongol advance to the heartland of Islam is halted.
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1261 - 1517Abbasid "shadow caliphs" are kept in Cairo by their Mamluk overlords.
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1517Sultan Selim I of the Ottoman Sultanate conquers the Mamluk Sultanate and transfers the caliphal title to his lineage.