Abdul-Rahman ibn Abi Bakr (died 666) was the eldest son of Abu Bakr, the first caliph in Sunni Islam. His mother was Um Ruman bint Amir ibn Uwaymir ibn Zuhal ibn Dahman and he was the full brother of Aisha. He and three other children of Abu Bakr namely Abdullah, Aisha and Asma were born sometime between 595 AD to 609 AD. It is said that he had a good sense of humour.
Unlike the rest of his family, including his father Abu Bakr and sister Aisha, he did not convert to Islam until the Treaty of Hudaybiyah in 628 AD.
Four generations of the family of Abdul-Rahman had the distinction of being the companions (sahaba) of the Prophet Muhammad namely Abdul-Rahman, his father Abu Bakr As-Siddiq, his grandfather Uthman Abu Quhafa and his son Abu Atiq Muhammad. It was believed that no other family held this distinction.
While still a non-Muslim, Abdul-Rahman fought from the side of Quraish in the Battles of Badr and Uhud.
In the Battle of Badr, he had an opportunity to kill his father, Abu Bakr, but he turned in another direction. Years later, after becoming Muslim, he told his father about it. Thereupon Abu Bakr replied: "If I had had such an opportunity, I would not have spared you."
In the Battle of Uhud before the fighting began, he came forward and threw down a challenge for a duel. Abu Bakr accepted the challenge, but Muhammad stopped him, saying, "Sheathe your sword, and let us continue to profit by your wise counsels."
After becoming a Muslim, Abdul-Rahman participated in all the battles fought by the Muslims and gained fame as a fierce warrior, especially in the Muslim conquest of Syria. He was one of the Mubarizun champions and fought duels in the battles for the Muslim army. The mubarizun unit of the Rashidun army was composed of elite warriors who were champion swordsmen, lancers and archers. In the battlefield his role was to undermine the morale of the enemy before the beginning of the battle by slaying their champions in duels.