Question

What Roman Empire ruler killed many Christians

Answer 1

The answer

On February 27, 380, the Roman emperor of the East Theodosius (347-395) signed, in the presence of the western Roman emperor Valentinian (371-392) and his co-ruler half-brother Gracian (359-383) a decree with the who declared Christianity the religion of the State and stipulated a punishment for those who practiced pagan cults.

Note

I hope I have been helpful

Answer 2

There were many emperors in the Roman Emperors that killed Christians such as emperors Diocletian, Maximian, Galerius, and Constantius. But the first emperor who persecuted Christians was emperor Nero.