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)