Abu Bakr, the first successor of Muhammad, according to Sunni beliefs, nominated Umar as his successor on his deathbed, and there was consensus in the Muslim community to his choice. Umar Ibn Khattab, the second caliph, was killed by a slave. His successor, Uthman Ibn Affan, was elected by a council of electors (Majlis), but was soon perceived by some to be ruling as a "king" rather than an elected leader. Uthman was killed by members of a disaffected group. Ali then took control but was not universally accepted as caliph by the governors of Egypt, and later by some of his own guard. He faced two major rebellions and was assassinated after a tumultuous rule of only five years. This period is known as the Fitna, or the first Islamic civil war. Under the Rashidun each region (Sultanate, Wilayah, or Emirate) of the Caliphate had its own governor (Sultan, Wāli or Emir).
Muawiyah, a relative of Uthman, and governor (Wali) of Syria became one of Ali's challengers, and after Ali's death, managed to overcome the other claimants to the Caliphate. Muawiyah transformed the caliphate into a hereditary office, thus founding the Umayyad dynasty.
In areas which were previously under Sassanid Persian or Byzantine rule, the Caliphs lowered taxes, provided greater local autonomy, greater religious freedom for Jews, indigenous Christians, and brought peace to peoples demoralized and disaffected by the casualties and heavy taxation that resulted from the decades of Byzantine-Persian warfare.
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