Gaius Suetonius Tranquillus, commonly known as Suetonius (c. 69 – after 122 AD), was a Roman historian belonging to the equestrian order who wrote during the early Imperial era of the Roman Empire. His most important surviving work is a set of biographies of twelve successive Roman rulers, from Julius Caesar to Domitian, entitled De Vita Caesarum. He recorded the earliest accounts of Julius Caesar's epileptic seizures. Other works by Suetonius concern the daily life of Rome, politics, oratory, and the lives of famous writers, including poets, historians, and grammarians. A few of these books have partially survived, but many have been lost. The book about Galba is short. Galba was the first emperor of the Year of the Four Emperors. Galba was able to ascend to the throne because Nero's death meant the end of Julio-Claudian dynasty. Suetonius includes a brief description of Galba's family history. Suetonius describes Galba as being of noble birth, and born into a noble patrician family. Suetonius also includes a brief list of omens regarding Galba and his assassination. Most of this book describes Galba's ascension to the throne and his assassination, along with the usual side notes regarding his appearance and related omens. Suetonius does not spend much time describing either any accomplishments nor any failures of his reign. According to Suetonius, Galba was killed by Otho's loyalists. About this time, Suetonius has exhausted all his imperial archival sources.