Cicero - The main protagonist, a gifted orator and politician rising through the ranks of the Roman Republic.

Tiro - Cicero's secretary and the first-person narrator of the novel, providing an inside look into Cicero's life and career.

Pompey - A powerful military leader and member of the First Triumvirate alongside Caesar and Crassus.

Caesar - Cicero's eventual rival, an ambitious military commander and populist politician seeking to expand his power.

Crassus - An extremely wealthy Roman belonging to the conservative faction and part of the First Triumvirate.

Catiline - A notorious revolutionary and Cicero's adversary who attempted an uprising against the Republic.

Cato the Younger - A staunch defender of the Roman Republic and opponent of the First Triumvirate's increasing power.