He ruled over the Rashidun Caliphate from 632 to 634 CE when he became the first Muslim Caliph following Muhammad's death. As caliph, Abu Bakr succeeded to the political and administrative functions previously exercised by Muhammad. He was commonly known as The Truthful Caliph (, ""). Abu Bakr's reign lasted for 2 years, 3 months and 11 days ending with his death after an illness. He ruled over the Rashidun Caliphate from 632 to 634 CE when he became the first Muslim Caliph following Muhammad's death.