معاوية بن أبي سفيان
The Battle of Siffin (; May–July 657 CE) occurred during the First Fitna, or first Muslim civil war, with the main engagement taking place from July 26 to July 28. It was fought between Ali ibn Abi Talib and Muawiyah I, on the banks of the Euphrates river, in what is now Raqqa, Syria.