Which emperor legalized Christianity with the Edict of Milan? (r. 306-337 AD)

The story behind the answer

Constantine I is correct: in 313 AD he and his co-emperor Licinius issued the Edict of Milan, granting religious tolerance across the empire, specifically legalizing Christianity and ordering the return of confiscated church property. This marked a decisive end to official persecutions and set the stage for Christianity’s growth within Roman society.

Context helps: Diocletian had led the Great Persecution (303–311), Maxentius was Constantine’s rival defeated at the Battle of the Milvian Bridge (312) after Constantine’s famed vision of the Chi-Rho, and Claudius II ruled earlier with no link to the edict. Memory tip: “C for Constantine, C for Christianity”—he made Christian worship constant in Rome.