Events By Place Roman Empire November 20 — Diocletian becomes Emperor. The Bagaudae in Gaul revolt against the Romans. By Topic Religion Patriarch Rufinus I succeeds Patriarch Dometius as Patriarch of Constantinople. Year 1 of the Coptic calendar (or 285). Births Ge Hong, Chinese Daoist philosopher, poet, alchemist, government official, and biographer (d. 364) Emperor Huai of Jin, emperor of the Jin Dynasty Deaths November — Numerian, Roman emperor Diophantus, Greek math… (More on 284)