It was started by a slave uprising
The first Islamic civil war or "Fitna " happened in the 7th century, after the Caliph Uthman Ibn Affan´s assassination (d. 656). According to Islamic tradition, close relatives were the ones to take responsibility for avenging the assassinated´s death so both his favorite wife, Aisha and his brother Ali got into a dispute over who would avenge Uthman Ibn Affan.
Ultimately the war ended by the signing a treaty in 661.
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Explanation:
The English Civil Wars (1642-1651) stemmed from conflict between Charles I and Parliament over an Irish insurrection. ... However, at Marston Moor (July 2, 1644) Charles lost control of the north; and the following year, at Naseby (June 14, 1645) the Parliamentary forces led by Oliver Cromwell routed his main field army