Robert Taylor

Marcus Vinicius

Deborah Kerr

Lygia

Leo Genn

Petronius

Peter Ustinov

Nero

Patricia Laffan

Poppaea

Finlay Currie

Peter

Abraham Sofaer

Paul

Marina Berti

Eunice

Buddy Baer

Ursus

Felix Aylmer

Plautius

Nora Swinburne

Pomponia

Ralph Truman

Tigellinus

Norman Wooland

Nerva

Peter Miles

Nazarius

Nicholas Hannen

Seneca

D.A. Clarke-Smith

Phaon

Rosalie Crutchley

Acte

Alfredo Varelli

Lucan

William Tubbs

Anaxander

Alfred Baillou

Christian Prisoner in Arena (uncredited)

Leslie Bradley

Hasta (2nd Praetorian) (uncredited)

Alfred Brown

Man (uncredited)

Adrienne Corri

Young Christian Girl (uncredited)

Lia Di Leo

Pedicurist (uncredited)

Franco Fantasia

Man (uncredited)

Al Ferguson

Apostle (uncredited)

Enzo Fiermonte

Mounted Captain (uncredited)

Dino Galvani

Senator (uncredited)

Richard Garrick

Slave (uncredited)

Robin Hughes

Christ (voice) (uncredited)

Sophia Loren

Lygia's Slave (uncredited)

Helena Makowska

Older Woman (uncredited)

Michael Mark

Fisherman (uncredited)

Clelia Matania

Parmenida (uncredited)

Richard McNamara

Legionnaire (uncredited)

Harriet Medin

Woman (uncredited)

John Myhers

Guard (uncredited)

Louis Payne

Apostle (uncredited)

Walter Pidgeon

Narrator (voice) (uncredited)

Aldo Pini

Headkeeper (uncredited)

Alberto Plebani

Steward (uncredited)

Paola Quattrini

Crying Girl (uncredited)

Alfredo Rizzo

Hairdresser (uncredited)

Amerigo Santarelli

Guard Tying the Christians (uncredited)

Leonardo Scavino

Man (uncredited)

Bud Spencer

Imperial Guard (uncredited)

Elizabeth Taylor

Christian Prisoner in Arena (uncredited)

Harry J. Vejar

Fisherman (uncredited)

Maria Zanoli

Woman (uncredited)

Christopher Lee

Chariot Driver (uncredited)