G. JULIUS CAESAR - imperator. We see him at age 52, en route home from his Gallic triumph, to Rome.
G. ASINIUS POLLIO - narrator. Later to become famous as a general and man of letters. We see him at age 25, a young man of Rome's fashionable literary set, fled to Caesar's camp from scandal in Rome.
AULUS HIRTIUS - Caesar's chief of secretariat.
TITUS LABIENUS - Caesar's deputy commander and chief-of-staff in the Gallic campaign. One of Rome's greater military figures, overshadowed in his own time only by Caesar and Pompey.
MARK ANTONY - a youthful Roman soldier and politician. A major figure in the later Civil Wards, future consort of Cleopatra, but at this point achieving his first fame as one of Caesar's lieutenants.
CORNELIUS BALBUS - Spaniard, originally an alien, now a naturalized Roman citizen. He is Caesar's chieft agent in the corruption of Roman politics, contact with senatorial intrigue; bagman and briber.
SCRIBONIUS CURIO - Tribune. A key operator in Roman politics. Caesar's chief spokesman on the Senate floor.
VERGCINGETORIX - Gallic chieftain. Organized the last great revolt of the Gallic tribes two years before the episode at Rubicon. Now being held for the anticipated triumphal celebration at which he will also be executed.
COMMANDER OF THE GUARD