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The Twelve Caesars is a set of twelve biographies of Julius Caesar and the first 11 emperors of the Roman Empire. The Twelve Caesars, also known as Lives of the Caesars (Latin: De vita Caesarum), which was written in 121 during the reign of the emperor Hadrian, was the most popular work of Hadrian's personal secretary, Suetonius, and is the largest among his surviving writings. It was dedicated to a friend, the Praetorian prefect Gaius Septicius Clarus, in 119.