The Hijra (هِجْرَة) is the migration of the Islamic prophet Muhammad and his followers to the city of Medina in 622
In September 622, warned of a plot to assassinate him, Muhammad secretly slipped out of Mecca with Abu Bakr. By degrees, Muhammad and his followers emigrated to the city of Yathrib, 320 kilometres (200 mi) north of Mecca. Yathrib was soon renamed Madinat un-Nabi, literally "the City of the Prophet", but un-Nabi was soon dropped, so its name in English is Medina, meaning "the city". The Muslim year during which the Hijra occurred was designated the first year of the Islamic calendar by Umar in 638 or 17 AH (anno hegirae = "in the year of the hijra").