Sister-wife of Njörðr

In Norse mythology, the sister-wife of Njörðr is the unnamed wife and sister of the god Njörðr, with whom he is described as having had the (likewise incestuous) twin children Freyr and Freyja. This shadowy goddess is attested in the Poetic Edda poem Lokasenna, recorded in the 13th century by an unknown source, and the Heimskringla book Ynglinga saga, a euhemerized account of the Norse gods composed by Snorri Sturluson also in the 13th century but based on earlier traditional material. The figure receives no further mention in Old Norse texts. The situation is further complicated in that narratives describing the birth of Freyr and Freyja contradictorily cite the birth of the siblings occurring either after or before Njörðr left Vanaheimr to live among the Æsir. In addition, the goddess Skaði is referred to as the mother of Freyr and Freyja in the Poetic Edda poem Skírnismál whereas otherwise she is a described as having been in an ill-fated relationship with Njörðr without direct association with the Freyr and Freyja.