In Norse mythology, Gefjon or Gefjun (with the alternate spelling Gefion) is a goddess associated with ploughing, the Danish island of Zealand, the legendary Swedish king Gylfi, the legendary Danish king Skjöldr, foreknowledge, and virginity. Gefjon is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources; the Prose Edda and Heimskringla, written in the 13th century by Snorri Sturluson; in the works of skalds; and appears as a gloss for various Greco-Roman goddesses in some Old Norse translations of Latin works.