In Norse mythology, Njor or Njordr (Old Norse Njörðr) is one of the Vanir and the god of wind, fertile land along the seacoast, as well as seamanship, sailing and fishing. The prose Edda says he has the power to calm the sea or fire. He is the husband of Skaði and father of Yngvi-Freyr and Freyja. Their mother was, according to the Heimskringla, Njord's own sister and lover. Apparently the Vanir, unlike the Æsir, had the custom of consanguineous marriage. His sister's name may also be Njord, according to the reconstruction of the name of a Teutonic goddess that Tacitus transliterated into Latin as "Nerthus" (= Njörðr). His dwelling is said to be Noatún ('Ship-town'). Njord is also a god closely associated with fertility, as are the Vanir in general.