Umar ibn al-Khattab

Timeline

1. c. 584–616Mecca · HejazHe grew up in Mecca, was known in his youth for his upright character, actively opposed the Muslim community, and at one point intended to assassinate Muhammad.
2. 616–634Medina · HejazAfter converting he became an important advisor to Muhammad, participated in the governance of Medina after the Hijra, and served as a core counselor during Abu Bakr's caliphate, earning prestige through decisive judgment and impartial enforcement.
3. 634–644Medina · HejazSucceeding Abu Bakr, he launched large-scale conquests: control of Syria after the Battle of Yarmouk, a devastating blow to Sasanian Persia at the Battle of al-Qadisiyyah (Nahavand), and the dispatch of forces to conquer Egypt. He established the provincial governor system, the zakat and land tax system, and adopted the Hijri calendar as the official era, laying the administrative framework of the early Islamic empire.