Abu Bakr was the founder and first caliph of the Rashidun Caliphate ruling from 632 until his death in 634. He was the most prominent companion, closest advisor and a father-in-law of the Islamic prophet Muhammad. Abu Bakr is one of the most important figures in Islamic history. Abu Bakr was born in 573 CE to Abu Quhafa and Umm Khayr. He belonged to the tribe of Banu Taym. In the Age of Ignorance, he was a monotheist and condemned idol-worshipping. As a wealthy trader, Abu Bakr used to free slaves. He was an early friend of Muhammad and often used to accompany him on trading in Syria. After Muhammad's invitation of Islam, Abu Bakr became one of the first Muslims. He extensively contributed his wealth in support of Muhammad's work and also accompanied Muhammad, on his migration to Medina.