Muhammad ibn Abi Bakr
Muhammad ibn Abi Bakr () was the Youngest son of Abu Bakr and one of the alleged killers of the third Sunni Caliph Uthman. He was not a companion of the Islamic prophet Muhammad but a Tabi'un. His mother was Asma bint Umais, who was a widow of Ja'far ibn Abi Talib prior to her second marriage with Abu Bakr. He became the adopted son of Ali, the fourth Rashidun Caliph and the first Imam of Shia Muslims, and became one of his generals.