Flavius Constantius, known as Constantius III, was an influential Roman politician and general of the 5th century. He rose to power in 421 as co-emperor with Honorius, following a successful military career. His ascent began around 410, when he eliminated rivals and supporters of his adversaries, consolidating his control over the Empire.
Among his military successes, he distinguished himself in bringing the Gallic and Spanish provinces back under Honorius' dominion, defeating the troops of Gerontius and Constantine III. Additionally, he faced and defeated the Visigoths under Ataulf, facilitating the stabilization of the region.
One of the most significant events in his political career was his marriage to Galla Placidia in 417, which tied him to the Theodosian dynasty.
Constantius' reign lasted only seven months, during which he exerted significant influence over the Western Empire. However, his appointment as co-emperor was not recognized by the Eastern Empire, and his sudden death in 421 interrupted his plans for unifying the Roman Empire under his command.
