# Constantine the Great: Emperor Who Changed the World

### Rise Through Civil War

Born around 272 CE in Naissus (modern-day Nis, Serbia), Flavius Valerius Constantinus was the son of Constantius Chlorus, a Roman military officer who would eventually become Caesar of the western empire. Constantine spent his youth at the court of Diocletian, essentially as a hostage ensuring his father's loyalty. He received an excellent education and military training, gaining firsthand knowledge of the complexities of governing Rome's vast territories during the Tetrarchy, Diocletian's system of four co-emperors designed to stabilize the empire.

When his father died in York in 306 CE, Constantine's troops immediately proclaimed him Augustus, though he initially accepted only the lesser title of Caesar. This act plunged the empire back into civil war, as multiple claimants vied for supremacy. Constantine proved himself a brilliant military commander and cunning politician. In 312 CE, he marched on Rome to face his rival Maxentius. Before the decisive Battle of the Milvian Bridge, Constantine reportedly experienced a vision of a cross of light in the sky bearing the inscription "In hoc signo vinces" (In this sign, conquer). He ordered his soldiers to mark their shields with the Chi-Rho, a Christian symbol, and won a spectacular victory.

Historical context illustration

### Conversion and the Edict of Milan

Whether Constantine's conversion to Christianity was a genuine spiritual experience or a calculated political move remains debated by historians. Christianity had been growing despite periodic persecutions, particularly the brutal campaign initiated by Diocletian in 303 CE. Constantine's mother, Helena, was a Christian, possibly influencing his sympathies toward the faith. Whatever his motivations, Constantine's embrace of Christianity transformed both the religion and the empire.

In 313 CE, Constantine and his eastern co-emperor Licinius issued the Edict of Milan, granting religious tolerance throughout the empire and specifically legalizing Christianity. This decree ended centuries of persecution and allowed Christians to worship openly, reclaim confiscated property, and build churches. Constantine went further, actively favoring Christianity through financial support, building magnificent churches (including the original St. Peter's Basilica in Rome), exempting clergy from certain taxes, and involving himself in theological disputes. Within a generation, Christianity evolved from a persecuted sect to the favored religion of the emperor himself.

#### Fascinating Fact

Constantine was only baptized on his deathbed in 337 CE. This was not unusual for the time; many Christians delayed baptism, believing it washed away all sins and wanting to ensure they died in a state of grace. Despite ruling as a Christian emperor for over two decades, he postponed this final commitment until the last possible moment.

### The Council of Nicaea

As Christianity grew, so did theological disputes that threatened to divide the faith. The most significant controversy involved Arianism, a doctrine taught by Arius of Alexandria, which held that Jesus Christ was created by God the Father and therefore subordinate to him, rather than being eternally co-equal and co-eternal. This debate was tearing the church apart, and Constantine, now sole emperor after defeating Licinius in 324 CE, recognized that religious division could undermine imperial unity.

In 325 CE, Constantine convened the Council of Nicaea, the first ecumenical council of the Christian Church, bringing together approximately 300 bishops from across the empire. Constantine himself presided over the proceedings, though he was not yet baptized. The council condemned Arianism as heresy and produced the Nicene Creed, a statement of Christian belief that remains fundamental to orthodox Christianity today. Constantine's involvement established a precedent for imperial involvement in church affairs that would characterize the Byzantine Empire and medieval Europe for centuries, creating a complex relationship between church and state authority.

### Constantinople: The New Rome

Constantine's most enduring legacy may be the city that bears his name. In 324 CE, he chose the ancient Greek city of Byzantium, strategically located on the Bosporus strait between Europe and Asia, as the site for a new capital. Over the next six years, Constantine transformed Byzantium into Constantinople, inaugurated on May 11, 330 CE. The new city was conceived as a Christian Rome, free from the pagan associations and senatorial politics of the old capital.

Constantinople was a marvel of urban planning. Constantine endowed it with magnificent churches, including Hagia Irene, forums, palaces, a hippodrome for chariot racing, aqueducts, and defensive walls. He populated it with Christians and granted it privileges equal to Rome, including its own Senate. The city's location provided strategic control over trade routes between Asia and Europe, between the Black Sea and the Mediterranean. Constantinople would endure as the capital of the Eastern Roman (Byzantine) Empire for over a thousand years after Rome's fall, preserving Roman law, Greek culture, and Christian theology, serving as a bulwark against invasions from the East, and ultimately outliving the Western Empire by a millennium.

### Reforms and Final Years

Beyond religious transformation and founding Constantinople, Constantine implemented significant military, monetary, and administrative reforms. He reorganized the army, separating frontier troops from mobile field armies that could respond quickly to threats anywhere in the empire. He introduced the solidus, a gold coin that remained stable for centuries and became the standard currency for international trade. He reformed the civil administration, creating a more centralized bureaucracy directly answerable to the emperor.

Constantine died on May 22, 337 CE, while preparing for a campaign against Persia. He was about sixty-five years old and had ruled for thirty-one years. Shortly before his death, he was finally baptized, receiving the Christian sacrament he had promoted throughout his reign. Upon his death, he was succeeded by his three sons, who quickly eliminated potential rivals and divided the empire among themselves. The church granted Constantine the title "Equal to the Apostles," recognizing his crucial role in Christianity's triumph. His conversion, his support for the church, his founding of Constantinople, and his involvement in establishing Christian orthodoxy made him one of history's most transformative figures. He bridged the classical pagan world and the Christian medieval one, fundamentally altering the trajectory of Western civilization. Whether saint or opportunist, visionary or pragmatist, Constantine reshaped the Roman Empire and established patterns of church-state relations that would influence European history for over a thousand years.