Semiramis, a powerful and beautiful Assyrian queen, oversees the construction of the luxurious city of Babylon. She falls in love with Kir, a fallen prince turned into a slave who corresponds to her love. But a palace conspiracy will make the two lovers separate and confront each other.
In the kingdom of Kindaor, traitor Sedesmondo kills his brother, the King of Kindaor, and becomes the tyrant of kingdom. He abandons the prince Arminio to beasts in the woods, but lions don't kill him and breed him as one of them.
Teodora, a Roman courtesan and former slave girl, marries the Roman emperor Justinian and assumes the throne as Empress of Rome. But the divide between nobility and slave is too great. Teodora seeks justice for her people, and revolution and armed conflict erupt in both Byzantium and Rome.
A powerful man posing as a gladiator in Rome's fourth century discovers a plan to put the beautiful Queen in prison, which he thwarts by exposing a sinister duke as a traitor.
The film is set in Naples. Two doubles, an American and a Neapolitan, alternate visiting Zaza, the maid of a magazine company, deceived by their resemblance.
