Synonyms for Diocletian (same or very similar meaning)
WordNet sense 1 (Roman Emperor who when faced with military problems decided in 286 to divide the empire between himself in the east and Maximian in the west; he initiated the last persecution of the Christians in 303 (245-313)):
Gaius Aurelius Valerius DiocletianFrom the ODE community, based on WordNetadd/edit