Sid James
Marc Antony
Kenneth Williams
Caeser
Jim Dale
Horsa
Amanda Barrie
Cleopatra
Joan Sims
Calpurnia
Kenneth Connor
Hengist Pod
Charles Hawtrey
Seneca
Julie Stevens
Gloria
Brian Oulton
Brutus
Michael Ward
Archimedes
Francis de Wolff
Agrippa
Victor Maddern
Segeant-Major
Sheila Hancock
Senna Pod
Jon Pertwee
Soothsayer
Gertan Klauber
Marcus
Warren Mitchell
Spencius
David Davenport
Bilius
Tanya Binning
Virginia
Tom Clegg
Sosages
Peter Gilmore
Galley Master
Michael Nightingale
Ancient Briton
Ian Wilson
Small Messenger
Peter Jesson
Seth
Brian Rawlinson
Hessian Driver
E. V. H. Emmett
Narrator (voice)
Wanda Ventham
Pretty Bidder (uncredited)
Mark Hardy
Guard at Caesar's Palace (uncredited)
Percy Herbert
Guard (uncredited)
Norman Mitchell
Heckler (uncredited)
Jill Goldston
Citizen (uncredited)