According to Islamic tradition, Muhammad receives his first revelation in the cave of Hira near Mecca, beginning his prophetic mission.
Approximate date.
The Prophet Muhammad and his followers migrate from Mecca to Medina; the year becomes the start of the Islamic calendar.
Muhammad and his followers enter Mecca almost without bloodshed, making it the centre of Islam.
After Muhammad dies in Medina, Abu Bakr is chosen as the first caliph, beginning the Rashidun Caliphate.
Rashidun forces defeat the Sasanian army in Iraq, opening the way to the capture of the capital Ctesiphon.
Rashidun Muslim forces defeat the Byzantine army, opening the way to the conquest of Syria and the Levant.
The last Sasanian king, Yazdegerd III, is killed, completing the Arab Muslim conquest of Persia.