Flavius Eugenius (d. September 6, 394) was a Roman usurper (392-394) against Emperor Theodosius I. Though himself a Christian, he was the last Emperor to support Roman polytheism.Gerard Friell (1998). Theodosius: The Empire at Bay (Roman Imperial Biographies). (Routledge; 1 edition (May 28, 1998)). ISBN-10: 0415170400 Life A former teacher of grammar and rhetoric, as well as magister scrinorum, Eugenius was an acquaintance of the Frank magister militum and de facto ruler of the Western Roman Empire Arbogast. Rise to power Following the death of Valentinian II, Arbogast, who had probably been the cause of Valentinian's murder or suicide, elevated Eugenius to the purple (22 August 392). The choice of Eugenius over proclaiming himself, offered to Arbogast two strong advantages: Eugenius, a Roman, was more suitable than Arbogast, a Frank, as an emperor; furthermore, th