Nummius Aemilianus Dexter, often erroneously called Flavius Lucius Dexter, was a figure of the late fourth century, reported as a historian, and acquainted with St Jerome. He was the son of St Pacian, an imperial office-holder, and dedicatee of a work of Jerome, the De Viris Illustribus. He also served as proconsul of Asia under emperor Theodosius I and hold the position of praetorian prefect of Italy in 395.