There were not any prosecution of the Roman Empire. An empire would not persecute itself. There were persecutions of the Christians. The first such persecution occurred under the emperor Nero.
The Roman emperors Diocletian and Galerius
The Holy Roman Empire, the first time the many German states had a single leader, despite that leader being more symbolic than anything else.
Byzantium Emipre
The first organized army was started by romules
Roman Catholics.
There was a persecution of Christians in the city of Rome in 64 AD. However, it was not an official persecution and it was not legislated. According to Tacitus, a Roman historian, the emperor Nero used the Christians and a scapegoat because there were allegations that he started the Great Fire of that year.
When was Roman fashion started? Well, that was easy! It was started when the first person felt like documenting it. Who ever wrote it down first was the one who started it all!
The first documented empire-wide Christian persecution occurred under Maximinus Thrax (reigned 235-238), though only the clergy were sought out. Decius who decreed the Decian Persecution in in 250. this was the first severe persecution of all Christians. Diocletian decreed the great Persecution in 303, which was the worse persecution.
The emperor who began the last great persecution of Christians in the Roman Empire was Diocletian. This persecution, known as the Diocletianic Persecution, started in 303 AD and aimed to suppress Christianity through the destruction of churches and scriptures, as well as the imprisonment and execution of Christians. Diocletian's efforts were part of his broader strategy to restore traditional Roman religious practices and strengthen the empire's unity. The persecution continued until the Edict of Milan in 313 AD, which granted religious tolerance to Christians.
----------------------- Julian the Apostate was Roman Emperor from 361 to 363 CE, after a dynasty of disreputable Christian emperors. He was opposed to persecution on religious grounds and took action to prevent the further persecution of pagans, but did not persecute Christians.
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).
By the continued persecution of people by the Roman Empire the spirit of reformation manifested itself in the colonies by the dissident groups.