In 622, Muhammad and the Muhajirun left Mecca and arrived at Yathrib, an event that would transform the religious and political landscape completely; the longstanding enmity between the Aus and Khazraj tribes was dampened as many of the two tribes embraced Islam. Muhammad was made the chief and united the Muslim converts of Yathrib under the name Ansar ("the Patrons" or "the Helpers"). After Muhammad's arrival, the city gradually came to be known as Medina (literally "city" in Arabic). Illustration from a religious manuscript, c. 1800. The Quba Mosque is the first mosque in history built by Muhammad.