Theodosius I

Theodosius I (“the Great,” r. 379–395) was the last Roman emperor to rule both the eastern and western halves of the empire under a single authority. Born in Hispania around 347 into a prominent military family, he rose in the army under his father, Theodosius the Elder. After his father’s sudden execution and a period away from court, Theodosius returned to prominence during a moment of crisis: the Eastern Empire had been rocked by the disastrous Battle of Adrianople (378), where the Goths killed Emperor Valens.

In 379, the western emperor Gratian appointed Theodosius as Augustus in the East, tasking him with stabilizing the Balkans and rebuilding an army badly depleted by civil war and frontier losses. Theodosius fought and negotiated with Gothic groups, culminating in the treaty of 382 that settled many Goths within imperial territory as federate allies. This arrangement brought short-term military relief but also signaled a growing dependence on non-Roman forces serving under their own leaders.

Theodosius’s reign was also defined by imperial intervention in religion. In 380 he issued the Edict of Thessalonica, aligning imperial policy with Nicene Christianity, and in 381 he supported the Council of Constantinople, which strengthened Nicene orthodoxy within the imperial church. Over time, his legislation increasingly restricted public pagan cult and certain forms of “heretical” Christian practice, helping to reshape the empire’s religious landscape in a more uniform, state-backed direction.

Politically, Theodosius repeatedly marched west to resolve succession crises. He defeated the usurper Magnus Maximus (388) and later the regime of Eugenius and the general Arbogast (394), briefly reuniting imperial rule. He died in 395, leaving the East to Arcadius and the West to Honorius. His legacy is double-edged: a capable crisis manager who restored imperial authority and advanced Nicene Christianity, yet one whose era entrenched federate military solutions and set the stage for a permanently divided empire.

While more difficult to find than Theodosius II, obtaining a solidus of Theodosius I is not hard. What is hard is waiting for a remarkable example. The present example is essentially unimprovable: crisp, lustrous, well-struck and perfectly centered.