Suetonius

Gaius Suetonius Tranquillus, known as Suetonius, was a Roman historian best known for his biographies of Roman emperors from Julius Caesar through Domitian. The biographies, which form a larger work conventionally known as Lives of the Twelve Caesars, were likely written during the reign of Hadrian and follow a consistent format, beginning with the subject’s early life and career and ending with their death but departing from the chronological format in the middle to describe their private life, appearance, and personality.