Shapur II, Sassanid ruler of the Persian…
344 CE
Shapur II, Sassanid ruler of the Persian Empire, has waged his campaign against Constantius II from 337, but it has so far been mostly unsuccessful.
Shapur had repelled Constantius’s invasion of Adiabene (Mesopotamia) in 343 but is unable to take the fortress of Singara in the siege of 344).