Umar ibn al-Khattab
Second Caliph (Amir al-Mu'minin)
"I have no concern with the world save through it I make provision for the hereafter."
Biography
The second of the 'Rightly Guided' caliphs and the commander of the faithful during the greatest years of the conquest, Umar transformed a movement into an empire. A companion of the Prophet Muhammad renowned for his stern justice and simplicity of life, he directed from Medina the astonishing campaigns that overran Syria, Egypt, and Persia, appointing and controlling generals like Khalid, Amr, and Sa'd across a front thousands of miles wide. He was also the architect of the state that governed the conquests — establishing the diwan register of pensions, the Muslim calendar, garrison cities, and the framework of taxation and protected 'People of the Book' status for conquered Christians and Jews that let a tiny Arab elite rule vast populations. Famous for entering Jerusalem humbly on foot and guaranteeing its Christians' safety, he was assassinated in Medina by a Persian captive in 644, at the height of the empire's expansion.
Did you know?
He is credited with founding the Islamic Hijri calendar, dating from the Prophet's migration to Medina in 622 — the calendar still used across the Muslim world.
Key Battles
Battle of Yarmouk
The Caliphate (Rashidun & Umayyad) victoryAugust 636 · 45,000 total casualties
Yarmouk was one of the most decisive battles in history. It annihilated the main Byzantine field army and permanently severed Syria and Palestine from the empire — Heraclius, who had just reconquered these lands from Persia, reportedly bade Syria a bitter farewell. It made the Arab conquest of the Roman East irreversible.
Battle of al-Qadisiyyah
The Caliphate (Rashidun & Umayyad) victoryNovember 636 · 20,000 total casualties
Qadisiyyah was the decisive battle of the conquest of Persia. It broke the main Sasanian army, opened the road to the capital Ctesiphon, and doomed the four-century-old Persian empire, which the Arabs would extinguish within a few years.
The Surrender of Jerusalem
The Caliphate (Rashidun & Umayyad) victoryApril 637 · 1,000 total casualties
The peaceful surrender of Jerusalem — only twenty-three years after the Persians had sacked it and seven after Heraclius restored the True Cross — brought the third-holiest city of Islam under Muslim rule, where it would remain, with interruptions, for centuries. Umar's covenant of protection became a model for the treatment of conquered peoples.
Life Journey
Timeline
c. 584
🌅 Birth
Born in Mecca
637
📍 Posting
Accepts the surrender of Jerusalem in person
November 644
✝️ Death
Assassinated in Medina