Arslan Senki

With the help of a few loyal followers, Arslan quickly learns that nothing is ever as it seems on the surface. His own family history, the identity of the masked stranger trying to kill him, and the cause of increasingly strange supernatural events are all mysteries to be solved. Set in a fictional representation of ancient Persia, this classic story (from Japanese author Dr. Yoshiki Tanaka) combines political intrigue, military tactics, and fantasy. — Description from novelcodex.org