Cicero's Brutus (also known as De claris oratibus) is a history of Roman oratory. It is written in the form of a dialogue, in which Brutus and Atticus ask Cicero to describe the qualities of all the leading Roman orators up to their time. It was composed in 46 BC, with the purpose of defending Cicero's own oratory. He begins with an introductory section on Greek oratory of the Attic, Asianic, and Rhodian schools, before discussing Roman orators, beginning with Lucius Junius Brutus, "The Liberator", though becoming more specific from the time of Marcus Cornelius Cethegus.