This is based upon the legends of the Assyrian consort, Shammuramat.
During the reign of Semiramis, the beautiful queen of the Assyrian people, Assyria reaches one of the periods of greatest splendour, and to crown her successes she gives the order to build the great city of Babylon.
A young woman of the court of great political ambition, Semiramis falls in love with Kir, a prince enslaved who reciprocates.
Kir, king of the Dardanians, is defeated in combat by General Onnos during a military campaign launched by the latter against Nineveh in Assyria.