Constantine is fighting against Barbarians with his father when he is called to Rome. In his way to Rome, he falls in an ambush planned by Maxence, who wants to become emperor.
| Actor | Role |
|---|---|
 Cornel WildeConstantine | Constantine |
 Belinda LeeFausta | Fausta |
 Massimo SeratoMaxentius | Maxentius |
 Christine KaufmannLivia | Livia |
 Fausto TozziHadrian | Hadrian |
 Tino CarraroEmperor Maximianus | Emperor Maximianus |
 Carlo NinchiConstantius Chlorus | Constantius Chlorus |
 Vittorio SanipoliApuleius | Apuleius |
 Elisa CeganiElena | Elena |
 Nando GazzoloLicinius | Licinius |
 Annibale NinchiGalarius | Galarius |
 Franco FantasiaRoman Soldier | Roman Soldier |
 Loris GizziRoman Prosecutor | Roman Prosecutor |
 Enrico GloriLivia's Father | Livia's Father |
| JJole MauroCeli, Fausta's Maid | Celi, Fausta's Maid |
 Nando TamberlaniNot listed | Not listed |
 Renato TerraNot listed | Not listed |
 Giuseppe AddobbatiNot listed | Not listed |
 Lia AngeleriNot listed | Not listed |
 Fedele GentileNot listed | Not listed |
| PPiero GiagnoniNot listed | Not listed |
 Gino MarturanoNot listed | Not listed |
| MMario MeniconiNot listed | Not listed |
| SSpartaco NaleNot listed | Not listed |
 Ugo SassoNot listed | Not listed |
 Raimondo Van RielNot listed | Not listed |