linguistic:paraphrasing
First Fitna

Mu'awiya's domain was generally immune to the growing discontent prevailing in Medina, Egypt and Kufa against Uthman's policies in the 650s. The exception was Abu Dharr al-Ghifari, who had been sent to Damascus for openly condemning Uthman's enrichment of his kinsmen. He criticized the lavish sums that Mu'awiya invested in building his Damascus residence, the Khadra Palace, prompting Mu'awiya to expel him. Uthman's confiscation of crown lands in Iraq and his alleged nepotism drove the Quraysh and the dispossessed elites of Kufa and Egypt to oppose the caliph.

Uthman sent for assistance from Mu'awiya when rebels from Egypt besieged his home in June 656. Mu'awiya dispatched a relief army toward Medina, but it withdrew at Wadi al-Qura when word reached them of Uthman's killing. Ali, Muhammad's cousin and son-in-law, was recognized as caliph in Medina. Mu'awiya withheld allegiance to Ali and, according to some reports, the latter deposed him by sending his own governor to Syria, who was denied entry into the province by Mu'awiya. This is rejected by Madelung, according to whom no formal relations existed between the caliph and the governor of Syria for seven months from the date of Ali's election.

Soon after becoming caliph, Ali was opposed by much of the Quraysh led by al-Zubayr and Talha, both prominent companions of Muhammad, and Muhammad's wife A'isha, who feared the loss of their own influence under Ali. The ensuing civil war became known as the First Fitna. Ali defeated the triumvirate near Basra at the Battle of the Camel, which ended in the deaths of al-Zubayr and Talha, both potential contenders for the caliphate, and the retirement of A'isha to Medina. With his position in Iraq, Egypt and Arabia secure, Ali turned his attention toward Mu'awiya. Unlike the other provincial governors, Mu'awiya had a strong and loyal power base, demanded revenge for the slaying of his Umayyad kinsman Uthman, and could not be easily replaced. At this point, Mu'awiya did not yet claim the caliphate and his principal aim was keeping power in Syria.