En el año 180, el Imperio Romano domina todo el mundo conocido. Tras una gran victoria sobre los bárbaros del norte, el anciano emperador Marco Aurelio decide transferir el poder a Máximo, bravo general de sus ejércitos y hombre de inquebrantable lealtad al imperio. Pero su hijo Cómodo (Joaquin Phoenix), que aspiraba al trono, no lo acepta y trata de asesinar a Máximo.

It is the word "horde" that had meant, for many countries and nations, bloody raids and being under humilating contribution for centuries - a strange and scary world with its own rules and customs. To be or not to be for Rus (Ruthenia), that is the price of the one-man mission as he is departing to this world to accomplish a feat. The film tells the story of how Saint Alexius, the Metropolitan of Moscow and Wonderworker of All Russia, healed the Tatar Queen Taidula, Jani-Beg's mother, from blindness, in 1357.

Constantine is fighting against Barbarians with his father when he is called to Rome. In his way to Rome, he falls in an ambush planned by Maxence, who wants to become emperor.