The Christian persecution of paganism under Theodosius I began in 381, after the first couple of years of his reign as co-emperor in the eastern part of the Roman Empire. In the 380s, Theodosius I reiterated Constantine's ban on pagan sacrifice, prohibited haruspicy on pain of death, pioneered the criminalization of magistrates who did not enforce anti-pagan laws, broke up some pagan associations and destroyed pagan temples.