Uthman ibn Affan (ʿUthmān bin ʿAffān; 573 or 576 – 17 June 656 CE), also spelled by Colloquial Arabic, Turkish, Persian and Urdu rendering Osman/Usman, was a second cousin, son-in-law and notable companion of the Islamic prophet Muhammad, as well as the third of the Rāshidun, or "Rightly Guided Caliphs". He played a major role in early Islamic history, and is known for having ordered the compilation of the standard version of the Quran. When Caliph Umar ibn al-Khattab died in office aged 60/61 years, Uthman, aged 68–71 years, succeeded him and was the oldest to rule as Caliph.
Under Uthman's leadership, the Islamic empire expanded into Fars (present-day Iran) in 650, and some areas of Khorāsān (present-day Afghanistan) in 651. The conquest of Armenia had begun by the 640s. His reign also saw widespread protests and unrest that eventually led to armed revolt and his assassination.
Uthman was married to Ruqayya, and upon her death, married Umm Kulthum. Both his wives having been elder daughters of Muhammad and Khadija earned him the honorific title Dhū al-Nurayn ("The Possessor of Two Lights"). Thus, he was also brother-in-law of the fourth Rāshidun Caliph Ali whose own wife, Fātimah, was Muhammad's youngest daughter.
Family tree of Uthman
Uthman was born to Affān ibn Abi al-'As, of the Umayya, and to Arwa bint Kurayz, of the Abdshams, both wealthy clans of the Quraysh tribe in Mecca. Arwa's mother was Umm Hakim bint Abd al-Muttalib, making Arwa the first cousin of Muhammad and Uthman his first cousin's son. Uthman had one sister, Amina.
Uthman was born in Ta'if. The exact date is disputed: both 573 and 576 are indicated. He is listed as one of the 22 Meccans "at the dawn of Islam" who knew how to write.
His father, Affan, died at a young age while travelling abroad, leaving Uthman with a large inheritance. He became a merchant like his father, and his business flourished, making him one of the richest men among the Quraysh.
On returning from a business trip to Syria in 611, Uthman learned of Muhammad's declared mission.