How does Constantine change Christians being persecuted by the Roman Empire?

Constantine significantly changed the plight of Christians in the Roman Empire by issuing the Edict of Milan in 313 AD, which granted religious tolerance and effectively legalized Christianity. This marked a shift from persecution to acceptance, allowing Christians to worship freely and hold public office. Constantine’s support also led to the construction of important churches and the promotion of Christianity as a unifying force in the empire, setting the stage for it to become the dominant religion in the following centuries.