Abbasid Revolution in the context of "Umayyad Caliphate"

The Abbasid Caliphate or Abbasid Empire was the third Islamic caliphate, founded by a descendant of Muhammad's uncle, Abbas ibn Abd al-Muttalib (566–653 CE), from whom the dynasty derives its name. The preceding Umayyad Caliphate was overthrown by the Abbasid Revolution in 750 CE (132 AH), after which the Abbasids ruled as caliphs from their base in Iraq, with Baghdad as their capital for most of their history.

The Abbasid Revolution had its origins and first successes in the easterly region of Khurasan, far from the Levantine center of Umayyad influence. The Abbasids first centered their government in Kufa, Iraq, but in 762 the second caliph al-Mansur founded the city of Baghdad and made it the capital. Baghdad became a center of science, culture, arts, and invention, ushering in what became known as the Golden Age of Islam. Baghdad housed several key academic institutions, such as the House of Wisdom, and along with its multi-ethnic and multi-religious population, made the city famous as a centre of learning across the world. The Abbasid period was marked by the use of bureaucrats in the government, including the vizier, as well as an in the ummah (Muslim community) and among the political elites.

Following the Islamic conquest in 641–642, Lower Egypt was ruled at first by governors acting in the name of the Rashidun Caliphs and then the Umayyad Caliphs in Damascus, but in 750 the Umayyads were overthrown. Throughout Islamic rule, Askar was named the capital and housed the ruling administration. The conquest led to two separate provinces all under one ruler: Upper and Lower Egypt. These two very distinct regions were governed by the military and followed the demands handed down by the governor of Egypt and imposed by the heads of their communities.

Egypt was ruled by many dynasties from the start of Islamic control in 639 until the early 16th century. The Umayyad period lasted from 658 to 750. The Abbasid period which came after was much more focused on taxes and centralizing power. In 868, the Tulunids, ruled by Ahmad ibn Tulun, expanded Egypt's territory into the Levant. He would rule until his death in 884. After years of turmoil under Ahmad ibn Tulun's successor, many citizens defected back to the Abbasids and in 904 they would reclaim power from the Tulunids. In 969, Egypt came under the control of the Fatimids. This dynasty would begin to fade after the death of their last ruler in 1171.

The Abbasid caliphs were the holders of the Islamic title of caliph who were members of the Abbasid dynasty, a branch of the Quraysh tribe descended from the uncle of the Islamic prophet Muhammad, Al-Abbas ibn Abd al-Muttalib.

The family came to power in the Abbasid Revolution in 748–750, supplanting the Umayyad Caliphate. They were the rulers of the Abbasid Caliphate, as well as the generally recognized ecumenical heads of Islam, until the 10th century, when the Shi'a Fatimid Caliphate (established in 909) and the Caliphate of Córdoba (established in 929) challenged their primacy. The political decline of the Abbasids had begun earlier, during the Anarchy at Samarra (861–870), which accelerated the fragmentation of the Muslim world into autonomous dynasties. The caliphs lost their temporal power in 936–946, first to a series of military strongmen and then to the Shi'a Buyid Emirs that seized control of Baghdad; the Buyids were in turn replaced by the Sunni Seljuk Turks in the mid-11th century, and Turkish rulers assumed the title of "Sultan" to denote their temporal authority. The Abbasid caliphs remained the generally recognized suzerains of Sunni Islam, however. In the mid-12th century, the Abbasids regained their independence from the Seljuks, but the revival of Abbasid power ended with the Sack of Baghdad by the Mongols in 1258.