Abu Bakr, born Abd Allah ibn Abi Quhafa, was a senior companion, closest friend, and father-in-law of the Islamic prophet Muhammad who served as the first Rashidun caliph, ruling from 632 until his death in 634. Abu Bakr was granted the honorific title al-Ṣiddīq by Muhammad, a designation that continues to be used by Sunni Muslims to this day. October 29, 573 – August 23, 634; died at 60. Alive at the same time as Muhammad, Brahmagupta, Pseudo-Dionysius the Areopagite, Umar ibn Al-Khattāb, and Alī ibn Abī Ṭālib. Wiki link