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

Geoffrey Dunn

Terpnos

Nicholas Hannen

Seneca

Rosalie Crutchley

Acte

John Ruddock

Chilo

Elspeth March

Miriam

William Tubbs

Anaxander

Pietro Tordi

Galba

Adriano Ambrogi

Wine Bibber (uncredited)

Anna Arena

Woman (uncredited)

Alfred Baillou

Christian Prisoner in Arena (uncredited)

John Binns

Officer (uncredited)

Leslie Bradley

Hasta (2nd Praetorian) (uncredited)

Alfred Brown

Man (uncredited)

Valentino Bruchi

Mirmillon (uncredited)

Adrienne Corri

Young Christian Girl (uncredited)

Liana Del Balzo

Woman (uncredited)

Lia Di Leo

Pedicurist (uncredited)

Franco Fantasia

Man (uncredited)

Al Ferguson

Apostle (uncredited)

Enzo Fiermonte

Mounted Captain (uncredited)

Enrico Formichi

Man with Wine Cup (uncredited)

John Fostini

Young Unbaptized Man (uncredited)

Dino Galvani

Senator (uncredited)

Richard Garrick

Slave (uncredited)

Jack George

Fisherman (uncredited)

Robin Hughes

Christ (voice) (uncredited)

Philip Kieffer

Apostle (uncredited)

Richard Larke

Guard (uncredited)

Sophia Loren

Lygia's Slave (uncredited)

Helena Makowska

Older Woman (uncredited)

Anna Mancini

Nubian Slave Girl (uncredited)

Michael Mark

Fisherman (uncredited)

Clelia Matania

Parmenida (uncredited)

Richard McNamara

Legionnaire (uncredited)

Harriet Medin

Woman (uncredited)

Dario Michaelis

Lydia's Guard (uncredited)

Ernesto Molinari

Fisherman (uncredited)

John Myhers

Guard (uncredited)

Louis Payne

Apostle (uncredited)

Walter Pidgeon

Narrator (voice) (uncredited)

Aldo Pini

Headkeeper (uncredited)

Paola Quattrini

Crying Girl (uncredited)

Dino Raffaelli

Man (uncredited)

Alfredo Rizzo

Hairdresser (uncredited)

Amerigo Santarelli

Guard Tying the Christians (uncredited)

Leonardo Scavino

Man (uncredited)

Bud Spencer

Imperial Guard (uncredited)

Raffaele Tana

Man (uncredited)

Elizabeth Taylor

Christian Prisoner in Arena (uncredited)

Carlo Tricoli

Apostle (uncredited)

Giuseppe Varni

Hairdresser (uncredited)

Romilda Villani

Slave Girl (uncredited)

Maria Zanoli

Woman (uncredited)

Christopher Lee

Chariot Driver (uncredited)