Siege of Emesa
635 CE.
Shown on the map at 34.723°, 36.715°.
The siege of Emesa was laid by the forces of the Rashidun Caliphate from December 635 up until March 636. This led to the Islamic conquest of Emesa, which was a major trading city of the Byzantine Empire in the Levant.
Text from the Wikipedia article Siege of Emesa, licensed CC BY-SA 4.0.