Constantius II

Constantius II led Roman forces against the Sassanid Persians under Shapur II at Singara in Mesopotamia. The battle was indecisive, with heavy losses on both sides. Constantius failed to achieve a decisive victory, prolonging the Roman-Persian conflict.

Constantius II defeated the usurper Magnentius at the Battle of Mursa Major. The victory was costly, with tens of thousands of Roman soldiers killed. It allowed Constantius to reunify the Roman Empire under his sole rule.

Constantius II appointed his cousin Julian as Caesar (junior emperor) and sent him to govern Gaul. This decision was intended to stabilize the western provinces but ultimately led to Julian's rebellion and civil war.

Constantius II attempted to recapture the fortress of Bezabde from the Persians. The siege failed, and Constantius was unable to dislodge Shapur II's forces. This failure exposed the eastern frontier to further Persian incursions.

While marching east to confront the usurper Julian, Constantius II fell ill and died of a fever at Mopsuestia in Cilicia. On his deathbed, he reportedly named Julian as his successor, ending the civil war without battle.