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4th Century

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306

Politics4th CenturyEurope

Constantine I Proclaimed Roman Emperor by Troops

Following the abdication of Emperor Diocletian in 305, the Roman Empire faced instability as power struggles emerged among claimants. In the province of Britain at Eboracum, now York, troops loyal to Constantius Chlorus elevated his son Constantine upon his father's death in July 306. The soldiers proclaimed Constantine Augustus, bypassing the Tetrarchy system designed to prevent such successions. This act defied the established order where Galerius held senior authority in the East. Constantine quickly secured his position in the western provinces through military support and political maneuvering. The proclamation set the stage for his eventual rise as sole ruler and the transformation of the empire.

Event Detail
312

Military4th CenturyEurope

Constantine Defeats Maxentius at Milvian Bridge

Following the collapse of the Roman tetrarchy established by Diocletian, rival claimants vied for control of the western empire. Constantine marched into Italy to challenge Maxentius, who had seized Rome. On October 28, 312, their forces clashed near the Tiber River at the Milvian Bridge. Constantine's troops prevailed in the fierce engagement, forcing Maxentius and many of his soldiers into the river where the usurper drowned. Constantine entered Rome as victor the next day and soon consolidated power in the West. This outcome shifted the balance of imperial authority and set the stage for broader political and religious changes across the empire.

Event DetailUS Military Atlas
324

Military4th CenturyEurope

Constantine Defeats Licinius at Adrianople

In the early fourth century, the Roman Empire remained divided between rival emperors following the collapse of the Tetrarchy system established by Diocletian. Constantine I, controlling the western provinces, clashed repeatedly with his eastern co-ruler Licinius over supreme authority. On July 3, 324, their armies met near Adrianople in Thrace, where Constantine deployed superior tactics including a feigned retreat that allowed his forces to cross the Hebrus River and envelop the enemy. Licinius suffered heavy losses exceeding 34,000 men and fled toward Byzantium. The victory consolidated Constantine's position and paved the way for his eventual sole rule after further campaigns.

Event DetailUS Military Atlas
324

Military4th CenturyEurope

Constantine Defeats Licinius at Chrysopolis

In the early fourth century, the Roman Empire remained divided under the Tetrarchy system established by Diocletian, with multiple co-emperors vying for supremacy amid ongoing civil strife. Constantine I, controlling the western provinces, had already clashed with his eastern rival Licinius at battles like Adrianople and the Hellespont earlier in 324. On September 18, Constantine's forces crossed the Bosphorus and engaged Licinius's army near Chrysopolis on the Asian shore opposite Byzantium. The decisive engagement saw Constantine's troops overwhelm their opponents, inflicting heavy casualties estimated around 25,000 on Licinius's side. Licinius fled to Nicomedia, where he soon surrendered, ending the civil wars of the Tetrarchy and granting Constantine sole rule over the entire Roman Empire.

Event DetailUS Military Atlas
330

Politics4th CenturyEurope

Constantine Dedicates Constantinople as New Capital

By the early fourth century, the Roman Empire faced division and external pressures, prompting Emperor Constantine the Great to seek a strategic eastern stronghold. Construction on the ancient city of Byzantium had begun years earlier under his direction to create a grand new metropolis. On May 11, 330 CE, Constantine presided over elaborate dedication ceremonies that formally renamed the city Constantinople and established it as the Eastern Roman Empire's capital. The event featured public celebrations, religious rites, and the transfer of administrative functions. This immediately elevated the city's status, drawing resources, officials, and populations eastward while symbolizing a shift in imperial focus away from Rome.

Event Detail
378

Military4th CenturyEurope

Visigoths Defeat Romans at Adrianople

In the late fourth century, the Roman Empire faced mounting pressure from migrating Germanic tribes displaced by Hunnic invasions from the east. Emperor Valens of the Eastern Roman Empire sought to manage the settlement of Visigoths within imperial borders while maintaining control. On August 9, 378, near Adrianople in present-day Turkey, Valens led a large Roman army against a Visigothic force that had rebelled due to mistreatment and food shortages. The battle unfolded as Roman legions engaged the mobile Gothic warriors in open terrain. Valens was killed along with much of his army in one of Rome's most devastating defeats. This clash highlighted the empire's vulnerabilities to barbarian migrations and internal administrative failures.

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394

Military4th CenturyEurope

Theodosius Defeats Usurper at Battle of the Frigidus

In the late fourth century, the Roman Empire faced internal division after the death of Emperor Valentinian II in 392, leading the Frankish general Arbogast to install the pagan rhetorician Eugenius as a puppet emperor in the West. Eastern Emperor Theodosius I, a staunch Christian ruler committed to unifying the empire under orthodox Christianity, marched westward with a large army including Gothic allies to confront the usurper. The two-day Battle of the Frigidus unfolded near the Vipava River in what is now Slovenia, with fierce fighting on September 5 giving way on September 6 to a sudden northerly wind that, according to contemporary accounts, blew dust and arrows into the faces of Eugenius's forces. Theodosius's troops routed the opposition, Eugenius...

Event DetailUS Military Atlas