Abū Bakr aṣ-Ṣiddīq ‘Abdallāh bin Abī Quḥāfah (Arabic: أبو بكر الصديق عبد الله بن أبي قحافة; c. 573 CE – 22 August 634 CE), popularly known as Abu Bakr (أبو بكر), was a senior companion (Sahabi) and—through his daughter Aisha—the father-in-law of the Islamic prophet Muhammad. Abu Bakr became the first openly declared Muslim outside Muhammad's family. Abu Bakr served as a trusted advisor to Muhammad. During Muhammad's lifetime, he was involved in several campaigns and treaties.
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 (الصديق, As-Saddīq). Abu Bakr's reign lasted for 2 years, 2 months, and 2 weeks ending with his death after an illness.
