CH101 - The Fourth Century

The Church Established, 303 - 400 A.D.

Politics of the Roman Empire
The Church Continues to Grow
Persecution under Diocletian
Constantine comes to Power
Donatism and Arianism
The Conflict with the Donatists
Constantine and Faith
Council of Nicea - 325 AD
The Nicean Creed
Beginnings of Monasticism

-- Coming --
Anthanasius and Anthony
The Cappadocian Fathers
Council of Constantinople - 381 AD
Key People:
Emperor Diocletian
Emperor Constantine
Athanasius of Alexandria
Saint Anthony
Basil the Great
Greggory of Nyssa

Key Documents:
How Persecutors Died
The Divine Institutes
Ecclesiastical History
Life of Antony
Life of Moses

Constantine Comes to Power
While the persecution was being carried out in the East where the numbers of Christians were much greater, the Western Christians experienced very little pressure. Under Constantius (the father of Constantine) some church buildings were destroyed in Britain, Gaul, and Spain - that was the extent of persecution - there is no evidence that any Christian was executed. In addition to this lack of brutality, Constantine's half sister was named Anastasia (anastasis - Greek for "resurrection"). This indicates a Christian influence in the household of Constantius.

The details are far more complicated with the empire being led by an Augustus ruler with a Caesar under him in the East and in the West. In addition, there were several struggles (like civil war) for control. A simple overview:

WEST: Constantius is Augustus and Severus is his Caesar (second in command)
EAST: Galerius is Augustus and Maximinus Daia, Caesar (nephew of Galerius)
Constantine (son of Constantius) is serving in the court of Galerius
306 - Constantius is dying, so Constantine quickly leaves Galerius to be with his father. Constantius dies and his troops declare Constantine his successor, but Galerius promotes Severus to be the Augustus
Through a series of battles (commanders attacking each other, one Caesar attempting to knock the other off to take command) and alliances - Constantine is coming close to ruling the West and forms an alliance with Licinius (in the East).

In 312 Constantine engaged Maxentius (son of Maximian) for sole rulership in the West at the famous "Battle of the Milvian Bridge." According to Lactantius (4th century Church historian and father), Constantine had a vision of a cross in the sky and heard a voice saying something like, "Go, and in this symbol, conquer." In the battle Maxentius drowns in the Tiber river attempting to retreat. Though the details are sketchy and not easy to fully reconcile, it appears that Constantine knew enough of Christianity to believe that his vision was of the God of the Christians, that he was chosen (or destined) by this God to rule the empire, and it was the beginning of his embrace of Christian faith. We will discuss the faith of Constantine in more detail later.

This battle leaves Constantine as the sole leader of the empire in the West.
313 - Constantine and Licinius sign the Treaty of Milan
This treaty marks an historic moment for the Christian faith. It is decreed that all Roman citizens would have religious freedom - the ability to worship however they wanted without interference from the empire. This did NOT represent Constantine making Christianity the official religion, but it does effectively put an end to the persecution of Christians.

Constantine and Licinius also entered something of a truce, putting an end to the leadership strife that had existed for the previous 20-25 years. However, Licinius disagreed with Constantine's support of the Christian Church. He wanted to promote the Roman gods and the Christians were his biggest obstacle. While Licinius and Constantine had a military truce, there was something like a religious cold war waging: Licinius persecuting Christians while Constantine supported them. This truce lasted until 323 AD when the two Augusti met in battle - Constantine defeated Licinius in battle and became the sole ruler of the Roman empire.

Constantine and the Christian Empire, by Charles Odahl - represents 31 years of research, retracing the steps of Constantine across Europe and the Eastern Empire. This is possibly the most exhaustive work on Constantine ever published.

Numerous CH101 readers have written to me with questions and critical comments about what I have written regarding Emperor Constantine. There is a significant percentage of conservative Protestants who believe Christianity suffered greatly under Constantine. As a young man I was taught that the Catholic Church started with Constantine and was the beginning of Christianity losing its way.
One reader expressed it very close to how I learned it as a young man:

"Paul said that the 'mystery of iniquity' was already at work in the church even during his day (2 Thes. 2:7). How much more in the years following the death of Paul and the other Apostles would the 'mystery of iniquity' be working."
While there are some valid points to be made for Christianity losing its zeal and spiritual power, Constantine gets a bad rap in MY opinion. If you are interested in learning more about Constantine I would highly recommend the text by Charles Odahl (to the right) to better decide if Constantine was a Christian or just a political opportunist. My articles will be edited using Odahl's excellent research:
Emperor Constantine comes to Power
Emperor Constantine and Christian Faith
Emperor Constantine at the Council of Nicea
Emperor Constantine and Worship of the Sun (Sol Invictus)
Emperor Constantine and Christians in the Military
Emperor Constantine Against the Donatists

Al Baker, CH101

I welcome your Questions, Comments or Criticisms:

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CH101 retains the right to edit and post comments/questions unless you specifically ask that your comments NOT be posted. Comments that are personal or private are never posted...only questions about Church History, the Bible, etc.


- was athanasius black
- tertullian/paul/marcion
- worship on sunday
- origen and universalism
- water baptism
- wine in ancient world
- fathers on NT Revelation
- fathers on holiness
- fathers on the military
- apostolic succession
- palestine or israel?
- candles in church
- pagan influences
- constantine-Sun worship
- constantine vs donatists

Book Reviews
- church traditions
- book reviews
- Buzzard - the Trinity
- David Bercot books

Biblical Issues
- what is false doctrine?
- pacifism and the NT
- who wrote NT Hebrews
- the trinity
- the apocrypha
- saul the persecutor
- NT, faith, resurrection
- NT and tithing
- Is the NT inspired?
- wine in the bible

Culture and Opinion
- christian tolerance
- faith and certainty
- end of the spear

A contemporary image of the Battle of the Milvian Bridge from the Arch of Constantine in Rome.
Source: Wikipedia
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Fourth Century Church History
4th Century Church History
Diocles and the persecution of Diocletian
Lactantius and persecution of Christians
Christians in the Roman Army - Military
Persecution of the Roman Empire
Constantine Ruler of the Roman Empire
Constantine Comes to Power
Constantius and Constantine
Constantine and Christian Faith
Constantine and the Sun God
4th Century Church Donatus and Arius
Donatus and Donatism - Baptism of the Lapsed
Arius - Arianism the Trinity
Origenist Controversy and the Trinity
Nicea - A Council or a Treaty
The Nicean Council 325 AD
How many Bishops at the Council of Nicea
Nicean Council and Homoousias
Council of Nicea and the Trinity
Nicean Creed and the Trinity