The story of Ultima I revolves around the evil wizard Mondain and his rule over the kingdom of Sosaria. According to the game's back story, Mondain created an evil gem over 1000 years ago that granted him immortality. Since then, Mondain has released monsters and beasts upon the land that ravage the villages and towns of Sosaria and cause most of the nobles to bicker amongst themselves. In an effort to stop Mondain's dominion, Lord British searches for a person to bring about the wizard's end. This call is answered by the player.