Setting the scene
By 622 CE, Muhammad, a merchant from Mecca, had been preaching Islam for 12 years, gaining followers but facing persecution from Meccan elites whose power rested on the Kaaba's polytheistic pilgrimage trade. Muhammad's monotheistic message threatened their economic and religious authority. In 622, after the death of his protector Abu Talib, the Quraysh tribe plotted to assassinate Muhammad. He and his followers faced increasing danger in Mecca.
What happened
Muhammad received an invitation from the city of Yathrib (later Medina), 200 miles north, where feuding Arab tribes sought a neutral arbitrator. In the Hijra (migration), Muhammad and his followers secretly left Mecca in stages during June-September 622. Muhammad and Abu Bakr hid in a cave for three days to evade pursuers, then traveled by camel to Yathrib, arriving September 24. The migration marked the beginning of the Islamic calendar (Year 1 AH). In Medina, Muhammad established the first Muslim community (ummah), drafting the Constitution of Medina that united Muslims, Jews, and pagans.
Why it still matters
The Hijra transformed Islam from a persecuted faith to a political and social system. In Medina, Muhammad became both religious leader and statesman, leading raids on Meccan caravans and eventually conquering Mecca in 630. The Hijra established the model of migration for religious freedom and the concept of the ummah transcending tribal loyalty. It marks the start of the Islamic era—Muslims date events from the Hijra, not Muhammad's birth. The migration demonstrated that Islam was not merely a personal faith but a complete social order, laying foundations for the rapid Islamic conquests that would follow Muhammad's death in 632.
Background
The Islamic calendar begins from this event. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.