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Constantine the Great | Biography, Facts & History

Ron Petrarca, Patricia Chappine
  • Author
    Ron Petrarca

    I received my bachelor's degree in history from George Washington University and later earned a master's degree in the same subject from Uppsala University in Sweden. I have been a writer and editor for more than two decades.

  • Instructor
    Patricia Chappine

    Patricia has a Ph.D. in Progress, History and Culture as well as a master's degree in Holocaust and genocide studies. She has taught heritage of the western world and U.S. history.

Meet Emperor Constantine the Great. Learn facts about his reign over the Roman Empire, as well as information about his life and family through a biography. Updated: 11/21/2023
Frequently Asked Questions

Who was Constantine and why was he important?

Constantine was one of the most important emperors in Roman history. He issued toleration for Christians in the Roman Empire and was the first emperor to covert to Christianity.

What are 5 facts about Constantine?

1. Constantine was the first Roman emperor to convert to Christianity.

2. He issued the Edict of Milan, which allowed for toleration of Christians in Rome.

3. He moved the capital of the Roman Empire to Byzantium (Constantinople)

4. The arch of Constantine was built to honor his victory at the Battle of the Milvian Bridge.

5. He came from a humble background.

What was Constantine's greatest accomplishment?

Issuing toleration for Christians in the Roman Empire is considered by many to be his greatest accomplishment. This lead to Christianity becoming the official religion of Rome.

Constantine the Great was one of the most important emperors in Roman history. He is mostly known for three things:

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  • 0:00 The Origins of Constantine
  • 0:59 Family
  • 2:10 Constantine's Conversion
  • 3:18 Achievements
  • 4:40 Lesson Summary

The life of Constantine was an interesting one, further so because his background was relatively unusual for a future Roman emperor. Constantine was born sometime around the year 272 AD in the city of Naissus on the Balkan Peninsula. Today, this region is part of Serbia, but during Constantine's lifetime, it was part of the Roman province of Moesia. Constantine's father, Flavius Constantius, was a soldier. His mother was a commoner of Greek descent.

Flavius Constantius was an exemplary soldier who rose to become one of the emperor's elite body guards. His skill then lead him to become a provincial governor, and eventually to the role of Augustus, a type of co-emperor. It is important to note that Constantine did not have noble roots. His father earned his place in the imperial hierarchy in as way that few other men in Roman history had ever been able to do.

Due to his father's elevated status, Constantine grew up in the imperial court of the emperor Diocletian. He did not directly inherit his father's position, but instead had to win his position via a number of civil wars with other contenders to the throne. In 324 AD he became emperor of both the Eastern and Western Roman empires.

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Reign of Constantine: When Was Constantine Emperor?

Constantine was one of the tetrarchs (four co-emperors of Rome) from 306 to 324. From 324 until his death in 337, he was the ruler of the entire empire. He was succeeded in death by his son, Constantine II.

Reign of Constantine: What Did Constantine Do?

Besides the Edict of Milan and his conversion to Christianity, Constantine was known for moving the capital of the Roman Empire to the city of Byzantium in 330 AD. This city was later renamed Constantinople.

Beginning in the 3rd century AD, the vast Roman Empire was beginning to fracture. Several different emperors and co-emperors were given control of large portions of the empire. Even though Constantine eventually rose to become sole ruler of the entire empire, this unity would not last. The division between the Greek-speaking Eastern Roman Empire and Latin-speaking Western Roman Empire would soon become permanent.

Constantine's capital grew to become the capital of what scholars now call the Byzantine Empire (or Eastern Roman Empire.) In fact, Constantine's move of the capital to Byzantium is seen as the event that marked the beginning of the Byzantine Empire. After the Roman Empire fell in 476 AD, the Eastern Roman Empire continued on until it was conquered by the Turks in 1453.

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Constantine the Great was one of the most important emperors in Roman history. He issued the Edict of Milan, which allowed for the tolerance of Christians in the Roman Empire, and converted to Christianity himself on his deathbed in 337 AD. Some people believe that he actually converted in 312 AD during the Battle of the Milvian Bridge. Constantine was originally part of a tetrarchy (rule of four emperors), but eventually rose to become sole ruler of Rome.

Constantine also ordered the construction of a number of important buildings, structures, and monuments, including the still-famous Arch of Constantine.

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Video Transcript

The Origins of Constantine

Born Flavius Valerius Aurelius Constantinus, Constantine the Great (also known as Constantine I) was born in 272 C.E. and became emperor of the Roman Empire in 306 C.E.

When Constantine first gained power, the Roman Empire was under a tetrarchy, or rule by four. The empire was administered by four officials. Under this system, Galerius controlled the Balkan provinces; Maximinus administered the area around and including Egypt; Severus controlled Italy, Spain, and Africa; and Constantius (Constantine's father) held Britain and Gaul. When Constantius died in 306 C.E., Constantine took over the title of emperor. Although Constantine was the first Roman Emperor to convert to Christianity, he did not legally impose that religion on the empire.

Family

Constantine was the son of Roman officer Flavius Valerius Constantius and a Christian woman named Helena. In 293 C.E. his father became the emperor of the western empire. Constantius sent his son east to serve in the military and learn the finer points of strategy. Constantine spent a great deal of time in the court of Emperor Diocletian before being declared emperor by Constantius' upon his death.

During his reign, Constantine was married twice. His first wife, Minervina, gave birth to a son, Crispus. Shortly thereafter, Constantine left Minervina for Fausta, because she had much stronger political ties than his first wife. Fausta gave birth to three sons (Constantine II, Constantius II, and Constans). In 326 C. E. Constantine had his son Crispus executed. Shortly thereafter, Fausta was forced to commit suicide. Although the reasons for these deaths remain uncertain, some historians believe that Crispus was having an affair with Fausta, his stepmother.

Constantine's Conversion

From 306 to 312 C.E., one of Constantine's co-rulers was Maxentius. Maxentius' hunger for more power led to his eventual invasion of Italy. He sought to oust Constantine from power and take over the empire. Constantine went on the offensive, invading Italy and soundly defeating Maxentius' northern forces. In one final, desperate move, Maxentius confronted Constantine's forces on the Milvian Bridge at the Tiber River.

Some ancient sources say that Constantine had a conversion experience before this battle when he saw the image of a Christian cross inscribed with the words 'in this conquer'. Maxentius was defeated and killed in the battle and Constantine rode into Rome triumphantly.

Despite this experience, Constantine did not receive the sacrament of baptism until the end of his life. He was also tolerant of the Christian religion as emperor. In 313 C.E. he agreed to the terms of the Edict of Milan, a document that gave Christians the freedom to practice their religion without persecution within the empire.

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