In the summer of AD 359, the armies of the Sasanian Persian Shahanshah ("King of Kings"), Shapur II (r. 309-379), invaded the Roman east. This invasion was the long-cherished revenge for a humiliating peace imposed on the Persians by the Romans sixty years earlier. The Roman historian Ammianus Marcellinus was an eyewitness to the most dramatic events of this new war, serving in the army of the emperor Constantius II (r. 337-361) as a protector domesticus, a guard cavalryman. His Res Gestae (Roman History) at this point is full of precise detail and evocative description. No action is more dramatic than the Siege of Amida. Dur: 16mins File: .mp3