The time is Northern Italy in the Middle Ages. Vittorio, the lord of Il Lago, who is vying for supremacy with his neighbor Bolzano, demands that Giulio, the new lord of Bolzano, make peace with him by marrying his half-sister Clarice, who is also Giulio's sister. On the night of the wedding, Clarice takes advantage of the opportunity to put a dagger in Vittorio's eye. This is the story of how two enemies are united by true love.