Hard to be a God [Trudno byt' bogom]

It tells the story of Don Rumata, who is sent from Earth to the medieval kingdom of Arkanar with instructions to observe and to influence, but never to directly interfere. Masquerading as an arrogant nobleman, a dueler and a brawler, Don Rumata is never defeated but can never kill. With his doubt and compassion, and his deep love for a local girl named Kira, Rumata wants to save the kingdom from the machinations of Don Reba, the First Minister to the king. But given his orders, what role can he play?