Gefjun (or Gefjon, Gefion) is one of the Æsir in Norse mythology. This name could be from Old Norse geð fiá meaning "chaste"[1] is one of the Asynjur in Norse mythology.[1] She appears only a few times in surviving sources. Medieval sources talk of her mainly as a goddess of chastity. However, modern scholarship suggests that she may originally have been a fertility goddess connected with ritual plowing,[2] and even that she was originally the same fertility goddess as Freyja.[3]
It has also been suggested that she is the origin of Grendel's mother who appears in the epic poem Beowulf.