Tobias Menzies as Marcus Junius Brutus (Season 1 and 2) - Portrayed as a young man torn between what he believes is right, and his loyalty and love of a man who has been like a father to him.
Lindsay Duncan as Servilia of the Junii (Season 1 and 2) - The mother of Marcus Junius Brutus, lover of the married Julius Caesar, and enemy of Atia of the Julii.