In 786 AD, three large Viking ships land in Kingdom of England. King Harald (Folco Lulli), the only Viking chieftain interested in maintaining peace, makes a plea to King Loter (Franco Ressel). The English king sends Sir Rutford (Andrea Checchi) to work out a deal with the Vikings. Rutford stages a surprise attack on the Vikings. King Harald is felled by an arrow fired by Rutford's chief assassin. During the battle, Harold's two young sons, Erik and Eron, are whisked away by one of his chiefs. Eron is rescued but Erik is left behind in the chaos.