A history of the rulers of the early Roman Empire, by the Roman historian, Suetonius. Commonly known as The Twelve Caesars , the work covers the following Roman rulers: The Deified Julius, The Deified Augustus, Tiberius, Gaius Caligula, The Deified Claudius, Nero, Galba, Otho, Vitellius, The Deified Vespasian, The Deified Titus, and Domitian.