Constantius II vs King Gwanggaeto

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.

Gwanggaeto became king of Goguryeo, one of the Three Kingdoms of Korea. His reign marked the beginning of a period of aggressive territorial expansion.

Gwanggaeto led military campaigns that conquered large parts of Baekje and brought Silla under Goguryeo's protection. These victories expanded Goguryeo's control over the Korean Peninsula.

Gwanggaeto repelled Japanese (Wa) forces that had invaded the Korean Peninsula in support of Baekje. His victory secured Goguryeo's dominance and is recorded on the Gwanggaeto Stele.

Gwanggaeto extended Goguryeo's territory into Manchuria, conquering the Xianbei and other nomadic tribes. This expansion made Goguryeo a major power in Northeast Asia.

After his death, a large stele was erected in his honor at the site of his tomb in Ji'an, China. The stele's inscription details his military campaigns and achievements, serving as a key historical source.