Diocletian — Roman emperor and reformer of the late third century Diocletian Emperor Diocletian (ruled 284–305) reorganized Roman government, military and coinage, initiated the Tetrarchy, launched the empire's last widespread persecution of Christians, and…
List of Roman emperors and principal dynasties List of Roman emperors Survey of Roman emperors from Augustus through the late Empire, organized by dynasty and major periods, noting key rulers, succession patterns, crises, and the split between West a…
