Robert Taylor

Marcus Vinicius

Deborah Kerr

Lygia

Leo Genn

Petronius

Peter Ustinov

Nero

Patricia Laffan

Poppaea

Finlay Currie

Peter

Abraham Sofaer

Paul of Tarsus

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)

Liana Del Balzo

Woman (uncredited)

Lia Di Leo

Pedicurist (uncredited)

Al Ferguson

Apostle (uncredited)

Enzo Fiermonte

Mounted Captain (uncredited)

Richard Garrick

Slave (uncredited)

Robin Hughes

Christ (voice) (uncredited)

Sophia Loren

Lygia's Slave (uncredited)

Clelia Matania

Parmenida (uncredited)

Harriet Medin

Woman (uncredited)

John Myhers

Guard (uncredited)

Walter Pidgeon

Narrator (voice) (uncredited)

Aldo Pini

Headkeeper (uncredited)

Amerigo Santarelli

Guard Tying the Christians (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)