Mu'awiya ibn Abi Sufyan

Mu'awiya ibn Abi Sufyan (born c. 602 CE in Mecca; died 680 CE / 60 AH in Damascus) was the founder of the Umayyad caliphate, the first hereditary dynasty in Islamic history. His birth year is uncertain; early Islamic sources cite dates such as 597, 603, or 605, and the commonly given c. 602 is an estimate rather than an attested date. He belonged to the Meccan clan of Abd Shams, part of the Quraysh tribe that initially opposed the Prophet Muhammad.

By the standard Sunni account he became a Muslim when Muhammad took Mecca in 630, though some early reports (cited by the historians al-Baladhuri and Ibn Hajar) hold that he had converted secretly earlier, around the time of the Hudaybiyya negotiations (628); the sources are not unanimous. Tradition records that he served Muhammad as a katib (scribe) and counts him among the Companions and scribes of revelation; these are sira- and hadith-level traditions, central to the Sunni view, rather than independently documented facts.

He was appointed governor of Damascus around 639 under the caliph Umar, and under Uthman his governorship was enlarged to include Palestine and (in 646/647) the Homs-Jazira district. Over two decades he built a strong Syrian power base and launched the first Arab naval campaigns against the Byzantines (e.g. Cyprus, 649). After the caliph Uthman's murder (656), Mu'awiya contested the caliphate of Ali, the Prophet's cousin and son-in-law. Their armies clashed at Siffin (657); the inconclusive battle led to arbitration. After Ali's assassination (661), Ali's son Hasan abdicated his claim to Mu'awiya in a treaty, a moment early sources call the "Year of Unity" (am al-jama'a). Mu'awiya made Damascus his capital and later named his son Yazid as successor.

He is a deeply contested figure: in the Sunni view he is honored as a Companion, while in the Shia view he is reviled for opposing Ali and is charged with poisoning Hasan. These are positions held by communities, not settled historical facts.