Cornel Wilde
— Constantine
Belinda Lee
— Fausta
Massimo Serato
— Maxentius
Christine Kaufmann
— Livia
Fausto Tozzi
— Hadrian
Tino Carraro
— Emperor Maximianus
Carlo Ninchi
— Constantius Chlorus
Vittorio Sanipoli
— Apuleius
Elisa Cegani
— Elena
Nando Gazzolo
— Licinius
Annibale Ninchi
— Galarius
Franco Fantasia
— Roman Soldier
Loris Gizzi
— Roman Prosecutor
Enrico Glori
— Livia's Father
Jole Mauro
— Celi, Fausta's Maid
Nando Tamberlani
Renato Terra
Giuseppe Addobbati
Lia Angeleri
Fedele Gentile
Piero Giagnoni
Gino Marturano
Mario Meniconi
Spartaco Nale
Ugo Sasso
