Constantinopla, 1401. El emperador de Bizancio pide al famoso caballero Tirante el Blanco que libre a la ciudad del asedio de los turcos. Después de su victoria, Tirante tendrá que afrontar una tarea más difícil: superar la oposición natural de Carmesina, heredera del Imperio otomano, a entregar su tesoro más preciado.

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.

Considered the finest example of Byzantine architecture in the world, Hagia Sophia was constructed on a scale unprecedented in human history. Built in the amazingly short time of five years, it bears witness to an amazing scientific knowledge and a rich cultural heritage from the past.