| cast |
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| Series Regulars | |||
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| Ciarán Hinds | Ciarán Hinds as Gaius Julius Caesar | Indira Varma | Indira Varma as Niobe |
| James Purefoy | James Purefoy as Mark Antony | Kenneth Cranham | Kenneth Cranham as Pompey Magnus |
| Kerry Condon | Kerry Condon as Octavia of the Julii | Kevin McKidd | Kevin McKidd as Lucius Vorenus |
| Lindsay Duncan | Lindsay Duncan as Servilia of the Junii | Max Pirkis | Max Pirkis as Gaius Octavian |
| Polly Walker | Polly Walker as Atia of the Julii | Ray Stevenson | Ray Stevenson as Titus Pullo |
| Tobias Menzies | Tobias Menzies as Marcus Junius Brutus | | |
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| Recurring & Guests | |||
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| Allen Leech | Allen Leech as Marcus Vipsanius Agrippa | Lyndsey Marshal | Lyndsey Marshal as Cleopatra |
| Paul Jesson | Paul Jesson as Scipio | | |