Mu'awiya I (Mu'awiya ibn Abi Sufyan)

Mu'awiya ibn Abi Sufyan was the founder of the Umayyad Caliphate, ruling as Caliph from 661 to 680 CE. A companion of the Prophet Muhammad and brother of Umm Habiba (a wife of the Prophet), Mu'awiya was appointed governor of Syria by Caliph Umar ibn al-Khattab in 639 CE, holding the governorship for two decades with exceptional political acumen.

Recognizing the naval threat posed by the Byzantine Empire in the Mediterranean, Mu'awiya created the first Muslim naval fleet, conquering Cyprus and winning the naval Battle of the Masts in 655 CE. Following the First Muslim Civil War (Fitna) and the arbitration after the Battle of Siffin, Mu'awiya established the Umayyad Caliphate in 661 CE, moving the political and administrative capital to Damascus. Renowned in Arabic literature for his political prudence and forbearance (hilm)—famously stating 'if there were but a hair between me and the people, I would never let it break'—Mu'awiya introduced the imperial postal service (Barid), unified the empire, and established hereditary succession.