In a.d. 331, Constantine, the Roman emperor, legalised Christianity and together with his mother, Helen, developed and excavated Christian sites.
Christianity was illegal in the Roman empire up until the 4th century a.d.
mnli hypothesis: Christianity was illegal in the Roman empire up until the 4th century a.d. premise: In a.d. 331, Constantine, the Roman emperor, legalised Christianity and together with his mother, Helen, developed and excavated Christian sites.