The Prophet Muhammad was believed by many Muslims to be a prophet and messenger of God. He was born in the year 570 in the city of Mecca. He is seen by Muslims as the last prophet sent by God to humanity. Muslims consider him to have reestablished the original monotheistic faith of Jesus, Adam, Moses, Abraham and other prophets.
The Prophet Muhammad was orphaned at a young age. His father died before he was born, and his mother died after he was born, so he was raised by his paternal uncle. Even though he couldn't read or write, he worked as a merchant. He was very religious and he would retreat to the mountains for nights of seclusion and prayer. At the age of 40, Muhammad was visited by the angel Gabriel and received his first revelation from God.
Those revelations continued for 23 years until his death, and they make up the verses of the Quran. The Quran is considered the "Word of God" and what Islam is based on. Muhammad began preaching, gained few followers and other Meccan tribes were antagonistic. He sent some of his followers to Abyssinia to escape persecution before he and his followers in Mecca migrated to Medina in the year 622. The emigration from Mecca to Medina, also known as the Hijra, marks the beginning of the Islamic Calendar.