Century

4th Century

4 sourced events from this period.

Events

4th Century Timeline

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306

Politics 4th Century Europehigh

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.

Why it matters: Constantine's elevation initiated a chain of civil wars that ended the Tetrarchy and led to his victory at the Milvian Bridge in 312. His reign promoted Christianity through the Edict of Milan and reshaped imperial administration, influencing European governance and religion for centuries.

Event Detail

324

Military 4th Century Europehigh

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.

Why it matters: The battle accelerated the end of the civil wars that had fragmented Roman power, enabling Constantine to reunify the empire under his leadership. It also foreshadowed the strategic importance of the site near the future Constantinople, influencing later Byzantine military history and the shift toward a Christian empire.

Event Detail US Military Atlas

356

Culture 4th Century Europehigh

Temple of Artemis Destroyed by Arson in Ephesus

In the ancient Greek world of the fourth century BC, the city of Ephesus in Asia Minor stood as a major center of trade and worship, home to the magnificent Temple of Artemis, one of the Seven Wonders of the Ancient World built around 550 BC with contributions from architects like Chersiphron. The temple served as a focal point for religious festivals, economic activity through pilgrimages, and cultural identity for the Ionian Greeks and surrounding regions. On July 21, 356 BC, a man named Herostratus deliberately set fire to the temple in an act of arson motivated by a desire for eternal fame, successfully destroying the structure despite its massive scale and marble construction. Contemporary accounts, including those by ancient historians like Strabo and Valerius Maximus, describe how the blaze consumed the wooden roof and interior, leaving the stone columns damaged but the site forever altered. The Ephesians quickly condemned Herostratus to death and reportedly banned mention of his name to deny him the notoriety he sought, though the story persisted through later writers. The event coincided closely with the birth of Alexander the Great, leading some ancient sources to link the two in legendary terms.

Why it matters: The destruction highlighted the vulnerability of even the grandest ancient monuments to individual acts of destruction and prompted immediate efforts at reconstruction that lasted centuries. It entered historical memory as a cautionary tale about fame-seeking through infamy, influencing later discussions of legacy and cultural heritage preservation across Mediterranean civilizations.

Event Detail

378

Military 4th Century Europehigh

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.

Why it matters: The defeat at Adrianople exposed the limits of Roman military superiority and accelerated the integration of Germanic peoples into imperial structures, contributing to the eventual fragmentation of the Western Roman Empire. It set precedents for barbarian federate arrangements that influenced European power dynamics for centuries. The event underscored broader patterns of migration and cultural exchange reshaping late antiquity.

Event Detail US Military Atlas