Sagas are prose stories and histories, composed in Iceland and to a lesser extent elsewhere in Scandinavia. The most famous saga-genre is the Íslendingasögur (sagas concerning Icelanders), which feature Viking voyages, migration to Iceland, and feuds between Icelandic families. However, sagas' subject matter is diverse, including pre-Christian Scandinavian legends; saints and bishops both from Scandinavia and elsewhere; Scandinavian kings and contemporary Icelandic politics; and chivalric romances either translated from Continental European languages or composed locally.
https://en.wikipedia.org/wiki/Saga