There is no real evidence of the Romans persecuting Christians before at least 97 CE, and only sporadic periods of persecution even after that. Professor Keith Hopkins (A world full of gods: the Strange Triumph of Christianity) says that although in its early years Christianity was both illegal and at loggerheads with the state, it was largely ignored until the three purges of 250, 257 and 303- 311.
Persecution of the Christians ended early in the fourth century, because Christianity received state patronage under Emperor Constantine.
He legalized Christianity and ended the persecution of Christians.
It was Constantine.=== ===
The Roman emperors Diocletian and Galerius
You may mean the Diocletianic persecution. If so, it is the persecution of Christians by the Roman Emperor Diocletian (ruled from 284 to 305 AD).
He ended the persecution of Christians
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Actually, no one did. Christians are still persecuted today.
A:It was Galerius himself who ended the Great Persecution that he had earlier persuaded Diocletian to institute. He had come to realise that persecution would achieve nothing in turning followers away from Christianity.
St. Nicholas of Myra did not escape from prison. When the persecution of Christians by Roman Emperor Diocletian ended and Constantine the Great became emperor in the year 306 he and all imprisoned Christians were released from prison.
The Roman Emperor Decius.
The last persecution of Christians (303-311) and the worse one, is attributed to the emperor Diocletian. However, there was the work of his co-emperor Galerius behind it. Galerius was a fiercer persecutor than Diocletian. This is the only persecution of Christians which has Benn called Great Persecution.
The persecution of Christians was effectively ended by Emperor Constantine the Great when he seized power in 306 AD. He issued the Edict of Milan in 313 AD, which granted religious tolerance throughout the Roman Empire and made Christianity legal. This marked a significant turning point for Christians, allowing them to practice their faith openly and without fear of persecution. Constantine's support for Christianity also led to its eventual establishment as the dominant religion in the empire.