List of Christians martyred during the reign of Diocletian

The reign of the emperor Diocletian (284−305) marked the final widespread persecution of Christians in the Roman Empire. The most intense period of violence came after Diocletian issued an edict in 303 more strictly enforcing adherence to the traditional religious practices of Rome in conjunction with the Imperial cult. Modern historians estimate that during this period, known as the Diocletianic or Great Persecution and extending several years beyond the reign of Diocletian, as many as 3,000−3,500 Christians were executed under the authority of Imperial edicts.^[1]

The church historian Eusebius, a Bishop of Caesarea who lived through both the "Little Peace" of the Church and the Great Persecution, is a major source for identifying Christian martyrs in this period. Martyr narratives flourished later as a genre of Christian literature, but are not contemporary with the persecutions and are often of dubious historicity. This article lists both historical and legendary figures traditionally identified as martyrs during the reign of Diocletian.