The Mistra Chronicles

15th-century Europe: a time of warring states and ruthless growing empires, divided churches and dynamic traders. In the midst of growing unrest, rivals battle for this treasure, each desperate to secure its power for their own nations. But no-one can discover its whereabouts; nor even knows if it is still in the possession of those born to guard it.... Four remarkable characters from four leading families provide the story as their crossed allegiances, plots and passions are played out on this epic scale.

A select band of soldiers led by Luke Magoris are given the mission of persuading Tamerlane to defend Constantinople. The great conqueror must turn his forces to the West to fight the Ottomans, who otherwise would destroy Constantinople and the Byzantine empire.