A significant theme is family. Family ties and loyalty play important roles in many Viking short stories. For example, in some sagas, a son avenges his father's death. Also, there is the theme of the relationship between humans and the gods, as Vikings had a strong belief system.
One common theme is adventure. Vikings were known for their travels, so stories often involve their voyages to new lands. Another is heroism. The Viking heroes like Ragnar are depicted as fearless in battle.