The Enmannsche Kaisergeschichte ('Enmann's History of the Emperors') is a modern term for a hypothetical Latin historical work, written in the 4th century, but now lost.
The German scholar Alexander Enmann made in 1884 a comparison of several late Roman historical works and found many similarities, which could not be explained by a direct literary relationship between the extant works (Eine verlorene Geschichte der roemischen Kaiser und das Buch De viris illustribus urbis Romae). Enmann postulated a theory of a lost historical work, which was the common source for authors including Aurelius Victor, Eutropius, and the author of the Historia Augusta.[1]
The work is not mentioned by any late Roman historian, but Enmann's analysis is today largely accepted and modified.[2] There are some scholars, especially Willem den Boer , who question its existence, but the majority accept it.[3]
The Kaisergeschichte was a brief historical work. It had covered the time from emperor Augustus to 337 or 357.[3] Besides the three historians mentioned above, it was used by Festus, Jerome, and the anonymous Epitome de Caesaribus.