what events led to the fall of the abbasid empire
Abbasid Caliphate Abbasids found themselves at odds with the Shia Muslims, most of whom had supported their war against the Umayyads, since the Abbasids and the Shias claimed legitimacy by their familial connection to Prophet Muhammad. Once in power, the Abbasids embraced Sunni Islam and disavowed any support for Shi'a beliefs. Shortly thereafter, Berber Kharijites set up an independent state in North Africa in 801. Within 50 years the Idrisids in the Maghreb and Aghlabids of Ifriqiya and a little later the Tulunids and Ikshidids of Misr were effectively independent in Africa. The Abbasid authority began to deteriorate during the reign of al-Radi when their Turkic Army generals, who already had de facto independence, stopped paying the Caliphate. Even provinces close to Baghdad began to seek local dynastic rule. Also, the Abbasids found themselves to often be at conflict with the Umayyads in Spain. The Abbasid financial position weakened as well, with tax revenues from the Sawād decreasing in the 9th and 10th centuries.[98]
Umayyad Caliphate Conflicts over Uthman's policies led to his murder in 656. Ali, the cousin and son-in-law of Muhammad, became caliph and moved his capital from Medina to Kufa. He soon met with resistance from several factions, especially from Muawiyah, the governor of Syria, who wanted Uthman's murderers arrested. Muhammad's wife, Aisha, and two companions of Muhammad, Talhah and Al-Zubayr, supported this demand. The conflict resulted in the First Fitna ("civil war") from 656 until 661. Ali was victorious against Aisha in the Battle of the Camel in 656 but the Battle of Siffin (July 657) against Muawiyah was inconclusive. Ali's position als Caliph was weakened when he first agreed to an arbitration but then refused to accept the verdict, that both Ali and Muawiyah should step down and a new Caliph be chosen.[36] In 661, the most vociferous opponents of the arbitration, the Kharijites, tried to kill both rivals; while Ali was killed, the attempt on Muawiyah failed. Ali's son Hasan (the second Imam for the Shias), accepted Muawiyah as Caliph on the condition that he be just to the people and keep them safe and secure, and that he not establish a dynasty to rule after his death.[37][need quotation to verify][38] In spite of the latter condition, this marked the beginning of the Umayyad dynasty, with its capital in Damascus.[39]