Meanwhile, vengeful Rosamund and other Gepid survivors and their allies plot the fatal downfall of the Lombard king.

To formally solidify his rule over the conquered Gepid people, Alboin intends to marry Rosamund.

Helmichis duels Alboin in the king's bedchamber but is disarmed by the warlord whose back is turned to his bride, who then fatally stabs him with a dagger.

Gepids and allied tribesmen hail Helmichis as the new king, until Alboin staggers into the court appearing utterly incredulous to Rosamund's betrayal.

He finally dies at her feet and the people resume celebrating their newly won liberation from the Lombards' tyranny.