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The Siege of Damascus (634) lasted from 21 August to 19 September 634 AD b[âº] before the city fell to the Rashidun Caliphate. Damascus was the first major city of the Byzantine (Roman) empire to fall in the Muslim conquest of Syria.
Hamath (fortress), the principal city of upper Syria, was situated in the valley of the Orontes, which it commanded from the low screen of hills which forms the water-shed between the source of the Orontes and Antioch.