Abu Bakr Abdullah ibn Uthman Abi Quhafa (Arabic: أَبُو بَكْرٍ عَبْدُ ٱللهِ بْنِ عُثْمَانَ ابي قحافة‎; c. 573 CE – 23 August 634 CE) was a companion and, through his daughter Aisha, a father-in-law of the Islamic prophet Muhammad, as well as the first of the Rashidun Caliphs. Abu Bakr became one of the first converts to Islam and extensively contributed his wealth in support of Muhammad's work. He was among Muhammad's closest companions, accompanying him on his migration to Medina and being present at a number of his military conflicts, such as the battles of Badr and Uhud.