The Edict of Milan is issued

313 CE, Mediolanum (Milan)

Following an agreement between Roman Emperor Constantine I and Licinius, the Eastern Roman Emperor, the Edict established religious tolerance for Christians within the Roman Empire, as well as all other religions. It proved to be a turning point as Christianity continued to grow in popularity across the Empire, with the Edict ultimately paving the way for Rome to adopt Christianity as its official religion in 380 CE.