Umar, also spelled Omar (عمر بن الخطاب‎ ʻUmar ibn al-Khaṭṭāb, "Umar, Son of Al-Khattab"; c. 584 CE – 3 November 644 CE), was a senior companion of the Prophet Muhammad. He was appointed by Abu Bakr to succeed him and occupied the position of caliph till his death.