De Imperatoribus Romanis

De Imperatoribus Romanis (DIR) is an online peer-reviewed encyclopedia about the emperors of the Roman Empire, including the Byzantine Empire. It was established in 1996 by Michael DiMaio, and hosted at Salve Regina University. The site has been defunct since June 2023, but it is still available in the Internet Archive.

The Cambridge Companion to the Age of Constantine says that its articles "offer sound overviews and a regularly updated bibliography".