Kevin McKidd Lucius Vorenus Actor Ray Stevenson Titus Pullo Actor Ciarán Hinds Gaius Julius Caesar Actor Kenneth Cranham Pompey Magnus Actor Polly Walker Atia of the Juli Actor James Purefoy Mark Antony Actor Tobias Menzies Marcus Junius Brutus Actor Lindsay Duncan Servilia of the Junii Actor Indira Varma Niobe Actor Max Pirkis Gaius Octavian Actor Kerry Condon Octavia of the Julii Actor Karl Johnson Porcius Cato Guest Star Lee Boardman Timon Guest Star Paul Jesson Scipio Guest Star Lorcan Cranitch Erastes Fulmen Guest Star Chiara Mastalli Eirene Guest Star Esther Hall Lyde Guest Star Coral Amiga Vorena the Elder Guest Star Ewan Bailey Pertinax Guest Star Lidia Biondi Merula Guest Star Jonathan Coy Actor for Cato Guest Star Kevin Dignam Lictor Guest Star Roger Hammond Chief Augur Guest Star Nicholas Hewetson Terrified Man Guest Star Adam Levy Saul Guest Star Ian McNeice Newsreader Guest Star Graham McTavish Urbo Guest Star Dominic Rickhards Aquinas Guest Star Andrea De Santis Phidias Guest Star Bruno Heller Executive Producer William J. Macdonald Executive Producer John Milius Executive Producer Anne Thomopoulos Executive Producer Frank Doelger Executive Producer Lucy Richer Executive Producer