Constantinople, 1401. The emperor of Byzantium asks the famous knight Tirant lo Blanc to free the city from the siege of the Turks. After his victory, Tirant will have to face a more difficult task: to overcome the natural opposition of Carmesina, heiress to the Ottoman Empire, to surrender her most precious treasure.

1197. King Kaloyan ascends the throne in hard times for Bulgaria. The country is still recovering from a century of Byzantine subjugation. He is forced to carry out a very flexible foreign policy in order to strength his positions. Pope Innocent III recognizes him as Emperor (Tsar), but a little later the fourth Crusade crosses the country under Emperor Baldwin. A new conflict is coming. Tsar Kaloyan wages the decisive battle at Adrianople and wins.