Uthman was the youngest member of a six-man delegation of Thaqif representatives sent to establish peace with the Islamic prophet Muhammad on 9 December 630, shortly before the Muslim conquest of their city in 631. The delegation embraced Islam during this meeting, though the 9th-century historians al-Waqidi and Umar ibn Shabba hold Uthman had already converted to Islam during a previous visit to Muhammad in Medina, but had kept it secret from his tribe. Despite his youth, Muhammad declared Uthman governor of Ta'if.
Uthman was the youngest of a six-man group of Thaqif representatives who traveled to establish peace with the Islamic prophet Muhammad on December 9, 630, just before the Muslim conquest of their city in 631. The delegation accepted Islam during this meeting, although some historians suggest Uthman had converted earlier but kept it hidden from his tribe.