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

D.A. Clarke-Smith
Phaon

Rosalie Crutchley
Acte

John Ruddock
Chilo

Arthur Walge
Croton

Elspeth March
Miriam

Strelsa Brown
Rufia

Alfredo Varelli
Lucan

Roberto Ottaviano
Flavius

William Tubbs
Anaxander

Pietro Tordi
Galba

Marika Aba
Dancer at Nero's Banquet (uncredited)

Adriano Ambrogi
Wine Bibber (uncredited)

Anna Arena
Woman (uncredited)

Alfred Baillou
Christian Prisoner in Arena (uncredited)

Giacomo Barnas
Senator (uncredited)

Scott R. Beal
Fisherman (uncredited)

John Binns
Officer (uncredited)

Francesca Biondi
Slave Girl (uncredited)

Carlo Borelli
Noble (uncredited)

Leslie Bradley
Hasta (2nd Praetorian) (uncredited)

Alfred Brown
Man (uncredited)

Valentino Bruchi
Mirmillon (uncredited)

Dante Ciriaci
Wine Bibber (uncredited)

Frank Colson
Man (uncredited)

Adrienne Corri
Young Christian Girl (uncredited)

Luca Cortese
Old Man (uncredited)

David Craig
Little Boy (uncredited)

Daniel de Jonghe
Apostle (uncredited)

Liana Del Balzo
Woman (uncredited)

Jack Del Rio
Apostle (uncredited)

Lia Di Leo
Pedicurist (uncredited)

Franco Fantasia
Man (uncredited)

Cesare Fasulo
Noble (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)

Carlo Ghisini
Guard (uncredited)

Trudy Glassford
Woman (uncredited)

Joan Griffiths
Woman (uncredited)

Robin Hughes
Christ (voice) (uncredited)

Adam Jennette
Man (uncredited)

Philip Kieffer
Apostle (uncredited)

Gipsy Kiss
Slave Girl (uncredited)

Lee Kresel
Man (uncredited)

Richard Larke
Guard (uncredited)

Sophia Loren
Lygia's Slave (uncredited)

Giovanni Lovatelli
Banquet Man (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)

Vincent Neptune
Apostle (uncredited)

Anna Maria Padoan
Young Unbaptized Woman (uncredited)

Louis Payne
Apostle (uncredited)

Walter Pidgeon
Narrator (voice) (uncredited)

Aldo Pini
Headkeeper (uncredited)

Alberto Plebani
Steward (uncredited)

Paola Quattrini
Crying Girl (uncredited)

Dino Raffaelli
Man (uncredited)

George Restivo
Apostle (uncredited)

Alfredo Rizzo
Hairdresser (uncredited)

Amerigo Santarelli
Guard Tying the Christians (uncredited)

Leonardo Scavino
Man (uncredited)

Alessandro Serbaroli
Officer (uncredited)

Bud Spencer
Imperial Guard (uncredited)

Raffaele Tana
Man (uncredited)

Elizabeth Taylor
Christian Prisoner in Arena (uncredited)

William Taylor
Guard Captain / Marcus' Guard (uncredited)

Michael Tor
Centurian (uncredited)

Giuseppe Tosi
Wrestler (uncredited)

Carlo Tricoli
Apostle (uncredited)

Renato Valente
Guard (uncredited)

Scilla Vannucci
White Slave Girl (uncredited)

Giuseppe Varni
Hairdresser (uncredited)

Dianora Veiga
Slave Girl (uncredited)

Harry J. Vejar
Fisherman (uncredited)

Romilda Villani
Slave Girl (uncredited)

Maria Zanoli
Woman (uncredited)

Christopher Lee
Chariot Driver (uncredited)