Sidney James

Mark Antony

Kenneth Williams

Julius Caesar

Kenneth Connor

Centurion Hengist Pod

Charles Hawtrey

Seneca

Joan Sims

Calpurnia

Jim Dale

Horsa

Amanda Barrie

Cleopatra

Victor Maddern

Sergeant-Major

Julie Stevens

Gloria

Sheila Hancock

Senna Pod

Jon Pertwee

Soothsayer

Francis de Wolff

Agrippa

Michael Ward

Archimedes

Brian Oulton

Brutus

Tom Clegg

Sosages

Peter Gilmore

Galley Master

Ian Wilson

Small Messenger

Warren Mitchell

Spencius

Michael Nightingale

Ancient Briton

Bill Douglas

Companion (uncredited)

Maurice Dunster

Citizen (uncredited)

Jill Goldston

Citizen (uncredited)

Roy Lansford

Mark Antony's Guard (uncredited)

Norman Mitchell

Heckler (uncredited)

Wanda Ventham

Pretty Bidder (uncredited)