<prompt> Translate the following text to EnglishMwaka 331 KK, Konstantino, mfalme wa Roma, aliruhusu Ukristo uingizwe katika sheria na pamoja na mama yake, Helen, wakafanya kazi ya kuchimba na kugundua maeneo ya Kikristo.  <response>: In a.d. 331, Constantine, the Roman emperor, legalised Christianity and together with his mother, Helen, developed and excavated Christian sites. 