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 Nicholas Woodeson Posca Guest Star Paul Jesson Scipio Guest Star Coral Amiga Vorena the Elder Guest Star Manfredi Aliquo Castor Guest Star Frank Baker Doctor Guest Star Lidia Biondi Merula Guest Star John Boswall Curial Magistrate Guest Star Alexander Brooks Milo Guest Star Matt Patresi Durio Guest Star Sean Madden Otho Guest Star Ian McNeice Newsreader Guest Star Sergio Di Pinto Stilicho Guest Star Alessandro Prete Tarquin Guest Star Roberto Davide Glabius Guest Star Jonathan Readwin Crito Guest Star Ted Rusoff Strabo Guest Star Nico Toffoli Roman Legionaire 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