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 David Bamber Marcus Tullius Cicero Guest Star Lee Boardman Timon Guest Star Nicholas Woodeson Posca Guest Star Suzanne Bertish Eleni Guest Star Paul Jesson Scipio Guest Star Manfredi Aliquo Castor Guest Star Lidia Biondi Merula Guest Star Allan Caister Pearce Head Priest Guest Star Giovanni Calcagno Vercingetorix Guest Star Fabio Carfora Sextus Guest Star Alexander Brooks Milo Guest Star Lydia Leonard Julia Guest Star Russell Mabey Crucified Man Guest Star Ian McNeice Newsreader Guest Star Bob Mercer Slave Trader Guest Star Gerard Monaco Lyco Guest Star Matt Patresi Durio Guest Star Anna Patrick Cornelia Guest Star Roberto Davide Glabius Guest Star Ted Rusoff Strabo Guest Star Alan Stocks Andros Guest Star John Boswall Curial Magistrate Guest Star Nico Toffoli Roman Legionaire Guest Star Ilir Jacellari Solder Guest Star Peter Lavin Additional Voices 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