During China's Tang dynasty the emperor has taken the princess of a neighboring province as his wife. She has borne him two sons and raised his eldest. Now his control over his dominion is complete, including the royal family itself.

During the 12th Century a boy is born to a tribal chief. He is named Temujin, which means "blacksmith." Nine years later, his father is murdered by the Tartars After a long struggle, just when Temujin reclaims tribal chief status, the Merkit tribe kidnaps his wife. In order to fight against the Merkits, Temujin has to use his mother as a pawn in exchange for troops from ally tribes. Temujin manages to rescue his wife only to realise that she is pregnant with the enemy's child. Enduring tremendous anguish, Temujin throws himself into battle against the Tartars and slaughters the leader of the intruders. He eventually takes his wife back and accepts her child. Later on, he begins a campaign to unify all Mongolian tribes. By the age of 40, he is bestowed the title "Genghis Khan", which means "oceanic ruler".