The spread of Christianity happened rapidly, partly because of persecution. People who had no fear of death had nothing to take away. Yet there was another reason for this: babies. While the Roman empire encouraged procreation and discouraged celibacy, many Roman men were killing their unwanted babies while the Christians were saving theirs. Of all the roman emperors, Diocletian was among the worst. Underneath him was a rising officer named Constantine. He disapproved of the emperor's religious persecution but bided his time carefully. It is possible that his mother Helena, whom his father Constantius Chlorus had divorced, was a Christian. Father and son got along well, and when Constantius became emperor in the West, it was expected that Constantine would succeed him. Then Diocletian made Maximinus Daia and Severus Caesars instead. But after Constantius Chlorus died, his army acknowledged Constantine as their Caesar.
It had been said that Rome was too big to be ruled by one man, and so the empire at the turn of the 4th century was ruled by a tetrarchy. In theory, there were 4 emperors at a time, but in reality, there were 2 "Augusti" and 2 Caesars, the former being more powerful. Constantine and Maxentius ruled in the west while Licinius and Maximinus Daia ruled the east. Despite any inclinations he may have had to Christianity, Constantine had the politics of a shark- as did many other rulers. To improve his foothold on power, he had married Minervina, the niece of Diocletian. Then he made a pact with Licinius in the east- he would fight Maxentius in the west while Licinius fought Daia in the East.
Constantine traveled southeast into Rome and met Maxentius at a crossing of the Tiber River called the Milvian Bridge. The night before battle, it was rumored that he had a dream in which he saw a symbol called the Chi-rho and was told that this symbol would bring him victory. The Romans took symbols very seriously and tended to gravitate towards any symbol or religion that might bring them victory. He had followed Sol Invictus, the unconquerable Sun, but he decided to fight under a new symbol. The God of the Christians became his god. Whether this change was immediate or gradual is debatable, but he believed that this god might bring him victory.
In an effort to protect the city, Maxentius had destroyed part of the Milvian Bridge to keep Constantine from crossing. Then, for whatever reason, Maxentius crossed the river on wooden pontoon bridges to make battle. This was a grave mistake, and when he tried to retreat across the bridge, he fell over the side and drowned. He had begun many building projects in Rome, but these projects would be finished by Constantine, and bear Constantine's name. The memory of Maxentius was expunged, and he was simply referred to as "the tyrant." Yet for Christians, there was reason to rejoice. After decades of persecution, Christianity was finally tolerated, and at times even promoted.
Licinius had started building a city called Byzas on a peninsula where two continents met. After Constantine subdued Licinius, Byzas was reclaimed, fortified, and renamed after Constantine. While he built many structures in Rome, he chose not to live there. Rome would gradually crumble in the west, while Constantinople would thrive for another 1000 years in the East- and with it, Orthodox Christianity.
The Romans had merged religion and politics for decades. Individuals in the empire were allowed to worship their own private gods, so long as they made their sacrifices to the Roman ones. Since many Christians had refused to sacrifice, they were persecuted. Constantine changed this. He did not make Christianity the state religion, but he protected it, built churches, and even took down certain religious centers for other religions. Many Roman coins were still minted with the image of Sol, but over time, Christian symbols started appearing.
While Constantine may have enjoyed his power, his married life was not necessarily happy. Minervina had borne him a son named Crispus, who many expected to succeed him. But after her death Constantine had remarried another woman named Fausta, the sister of Maxentius, who was about the same age as Crispus. After rumors of an affair between Crispus and Fausta, Constantine had his son executed. Then, either he had Fausta murdered or she committed suicide. The kingdom would eventually be divided among his other sons: Constantine II, Constans, and Constantius II. These sons warred against each other.
Despite his new-found faith, Constantine still bore the responsibilities of earthly rule, and with that huge responsibility came huge mistakes. Politicians want victory, and Christianity had given him many victories. Yet after his victories, finding the truth about his new belief system became his passion. It soon became evident that Christians were divided on many issues. One of these issues was the deity of Christ.
Most Christians believed that Jesus was all God and all man. Yet a certain teacher named Arius believed differently. While he acknowledged that Jesus was related to God, he believed Jesus to be a created being and therefore not God. Because of this and other disagreements, a major church council was held in the summer of 325. During this council, the teachings of Arius were rejected, and the Nicene creed was developed. This creed became a central doctrine in the early church. Contrary to the narrative of The DaVinci Code, the Council of Nicaea had nothing to do with the canonization of the Bible. What the early church had disagreed on was doctrine, and the first Council brought some clarity.
Was Constantine really a Christian, or was he just a pragmatic leader who found a belief system that taught honesty, social responsibility, and respect for earthly authority? If all he wanted was authority and respect, he certainly got those things. Some may ask why he was not baptized until the end of his life. In those days, many considered serving in politics or the military to be unworthy of a Christian. The Roman military had traditionally demanded sacrifice to its gods and had therefore persecuted many Christians in the past. Besides this, being a soldier meant killing, and he had put his son to death, along with several of his relatives. Therefore, he waited to be baptized. He was on his way to war in Persia when his health began to deteriorate and was formally baptized into the church before breathing his last.
It was not until the late 4th century that another emperor would make Christianity the state religion: Theodosius. It is ironic that the empire that had once fed Christians to lions was now embracing that same religion. Obviously, being the leader of a Christian nation or being part of a Christian nation does not make a person a Christian in God's eyes. Yet the truth of Christianity does not hinge on the faith of Constantine or Theodosius; it hinges on faith in Jesus Christ. Christianity is not about establishing an earthly kingdom through conquest; it as about building a heavenly kingdom centered around worship of the one true God.