Gaius Suetonius Tranquillus wrote the Lives of the Twelve Caesars — biographies of Julius Caesar through Domitian — probably in the early second century AD, and the work has been read continuously ever since, generating controversy about its reliability that has not diminished its influence by the slightest degree. Suetonius was the secretary of the emperor Hadrian before being dismissed, apparently for inappropriate familiarity with the empress, and he had access to the imperial archives during his service. Whether he actually used the archives, and how judiciously, is a question classical scholars continue to disagree about.