Final answer:
Christians were persecuted and tortured in various locations and time periods, such as during the Great Persecution by Diocletian and the formal persecution of Christians under Diocletian.
Step-by-step explanation:
Christians were rounded up and tortured in various locations during different periods of history. One notable instance was the Great Persecution carried out by Diocletian beginning in 303. During this time, Christians were arrested, tortured, and executed, with their buildings and sacred books destroyed. Another example is the formal persecution of Christians under the emperor Diocletian in 303-311, which focused on destroying churches. Additionally, the Christian Roman state engaged in persecutions of pagans and unbelievers, resulting in violence and destruction of their temples.