What would you sacrifice to live forever?

As Emperor Konstantine desperately searches for the fulfillment of a prophecy that could save his empire, dark forces mount to lay siege to the city of Constantinople. At the same time, Gylou, a mysterious immortal, with ties to Hell, arrives in the ports and catches the eye of the Emperor. Immortalis tells of the last days of Constantinople, the fall of the last great Roman outpost, and the love affair that destroyed an empire.