The Twelve Caesars
"The Twelve Caesars" served as a model for the biographies of 2nd- and early 3rd-century emperors compiled by Marius Maximus. This collection, apparently entitled "Caesares", does not survive, but it was a source for a later biographical collection, known as "Historia Augusta", which now forms a kind of sequel to Suetonius' work. The "Historia Augusta" is a collective biography, partly fictionalized, of Roman emperors and usurpers of the second and third centuries.