Jebel Thaur, Mecca
Jebel Thaur, a mountain to the south of Mecca where Muhammad (peace be upon him) found refuge in a cave. During his life time, Muhammad's (peace be upon him) uncle Abu Talib had offered him protection from his enemies, but with his passing the Prophet's (peace be upon him) life was in danger. There had been an assassination attempt on his life. So Muhammad (peace be upon him) decided to move the fledgling Muslim community to Medina. This migration became the Hijra. The Hijra marks the beginning of the Islamic calendar.