The Arab Conquests — From Arabia to Spain in a Century
When Muhammad died in June 632, his political community controlled the Arabian Peninsula. One hundred years later, the Islamic world stretched from the Atlantic coast of Spain to the borders of India and China. No empire in history has expanded so far, so fast. Understanding why requires examining both the extraordinary capabilities of the Arab armies and the catastrophic vulnerability of their targets. The Byzantine-Sassanid War of 602-628 was the decisive precondition. The two superpowers of the ancient world had spent a generation in mutually exhausting conflict: the Sassanid Persians had briefly conquered Egypt, Syria, and Palestine (619-628), capturing Jerusalem and the True Cross; Heraclius's Byzantine counter-offensive then destroyed Persian power at the Battle of Nineveh (627). Both empires emerged financially ruined, demographically depleted, and militarily exhausted. Into this vacuum stepped Arab armies energized by religious conviction and organized by the caliphs who succeeded Muhammad. The Arab military system combined several advantages. The camel provided strategic mobility across desert terrain that cavalry could not sustain. Arab warriors fought with exceptional ferocity and were motivated by religious duty and the prospect of substantial material reward. The early caliphate's policy toward conquered populations was pragmatic: Christians, Jews, and Zoroastrians were recognized as dhimmis who could practice their faith in exchange for a poll tax. For populations accustomed to heavy Byzantine or Persian taxation, and tired of doctrinal disputes imposed by distant emperors, this was often genuinely preferable. The milestones of conquest read like a roll-call of history: Battle of Yarmouk (636), Byzantine Syria lost permanently; fall of Jerusalem (638), Caliph Umar entering the city on foot in simple clothes; Battle of al-Qadisiyyah (636) and Nihavand (642), Sassanid Persia destroyed after 1,200 years of Persian imperial tradition; Egypt fallen by 642; North Africa by 698; the Visigothic Kingdom of Spain conquered between 711 and 714 by Tariq ibn Ziyad crossing from Africa with 7,000 men and destroying an army of perhaps 90,000 at Guadalete. Only the walls of Constantinople (twice besieged, 674-678 and 717-718, repelled by Greek fire) and Frankish infantry at Tours (732) checked the advance. The cultural consequences were as profound as the military. Arabic spread as the common tongue of a vast civilization, displacing Greek in Egypt and Syria, Latin in North Africa, Aramaic across the Fertile Crescent. The translation movement of the eighth and ninth centuries preserved and transmitted Greek philosophy and science to medieval Europe. The Dome of the Rock (691, Jerusalem) announced the new civilization's arrival with a monument of stunning architectural confidence.
- Year: 632 CE
- Category: Military
