Answer
The Battle of Siffin took place between 657 and 661 AD between the armies of Ali ibn Abi Talib, the fourth caliph of Islam, and Muawiyah ibn Abi Sufyan, the governor of Syria and a member of the Umayyad clan. The battle was fought in Siffin, a village on the Euphrates River in present-day Syria. The battle was inconclusive, with both sides claiming victory.