Star-studded, epic adaptation of Henryk Sienkiewicz's novel based in Rome during the time of Nero. Marcus Vinicius (Robert Taylor), a commander in the army, returns to the city and falls in love with a Christian girl called Lygia (Deborah Kerr). However, as he is a pagan, she rejects his suit and refuses to have anything to do with him. Meanwhile, Nero (Peter Ustinov) burns down the city, blames it on the Christians, and prepares to feed them to the lions.