Omar ibn al-Khattab — the second Caliph of Islam (634–644 CE) — who oversaw Islam's most dramatic period of military expansion (Persia, Egypt, the Levant), established the Islamic administrative state, and is revered in Sunni Islam as a model of just and austere leadership.
Built the administrative infrastructure of the Islamic caliphate during Islam's most rapid expansion — establishing the diwan (administrative register), the Islamic calendar, and the principles of consultation (shura) that defined early Islamic governance.
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