Lucius Aelius Helvius Dionysius was a Roman statesman who served as the Proconsul of Africa from 296 to 300 and as the Praefectus urbi from 301 to 302."Proconsuls of Africa, 337-392", Phoenix, 39 (1985), pp. 144-153
References
Further reading L. Aelius Helvius Dionysius 12, The Prosopography of the Later Roman Empire, volume 1, Cambridge University Press, 1992, , p. 260.