Emperor Diocletian, urged on by his co-emperor Galerius, issued an edict demanding that Christian churches be razed, sacred texts burned, and Christians stripped of legal rights and government office. It marked the opening of the last and most severe wave of Roman persecution before Constantine's later toleration, producing a generation of martyrs venerated for centuries afterward.
The edict was torn down almost immediately by a bold Christian in Nicomedia, who was tortured and burned alive for the act, an early sign of the defiance the persecution would provoke rather than extinguish. Diocletian, an able administrator obsessed with restoring Roman order after decades of crisis, viewed the growing Christian church as a rival power structure that undermined the traditional gods believed to protect the empire.
Over the following decade, Christians faced confiscation of property, destruction of scripture, and demands to sacrifice to the Roman gods on pain of death. Diocesan records, church buildings, and clergy were specifically targeted in a campaign historians call the 'Great Persecution.' Yet the persecution ultimately failed: within a decade, Constantine would issue the Edict of Milan, and Christianity's rapid rise afterward made the Diocletianic persecution the last major imperial attempt to suppress the faith by force. The scale of martyrdom during this period became foundational to Christian memory, commemorated in liturgical calendars for centuries.