A 13th-century manuscript preserves the only known references to Njörðr's unnamed sister-wife. The Poetic Edda poem Lokasenna records Loki accusing Njörðr of begetting a son with his own sister. Snorri Sturluson wrote Ynglinga saga in the same century, describing how Njörðr lived among the Vanir and took his sister as wife by their custom. These texts remain the sole Old Norse sources mentioning this figure. No other medieval Icelandic or Norwegian text expands on her identity or story.
Chronological Contradictions In Narratives
Ynglinga chapter four states Freyr and Freyja were born before Njörðr left Vanaheimr for Asgard. Gylfaginning section thirteen claims they arrived after he came to live with the gods. Skírnismál verse one calls Freyr "our boy" while Skaði speaks to him as if he were her child. This creates a direct conflict about whether the twins existed before or after their father moved to Asgard. Lokasenna verse thirty-two hints at Vanic incest occurring during Freyja's time there. Scholars must choose which timeline reflects older tradition versus later Christian-influenced editing.Scholarly Interpretations Of Vanic Customs
Jacob Grimm published Teutonic Mythology in 1835 arguing that brother-sister marriage was an ancient Indo-European practice preserved among the Vanir. Jan de Vries suggested this custom survived as a cultural remnant in early Germanic religion. Rudolf Simek noted that Tacitus described Nerthus as a female earth goddess whose name matches Njörðr. Georges Dumézil compared Hadingus' story in Saxo Grammaticus' Gesta Danorum to Njörðr's life, noting parallels between foster-sister relationships and royal marriages. These theories attempt to explain why a god would marry his twin sister according to Vanic law.Etymological Links To Nerthus
Tacitus wrote Germania in the first century describing rituals around a goddess named Nerthus. Her name is etymologically identical to Old Norse Njörðr despite being female. Some scholars propose a single hermaphroditic deity split into two figures over time. Others suggest they were originally a married twin pair similar to Freyr and Freyja. The connection remains speculative since no text explicitly names the sister-wife beyond her relationship to Njörðr. The linguistic link provides the strongest evidence for reconstructing her original identity.Potential Names And Divine Pairs
The name Njörun appears in skaldic kennings appended to the Prose Edda under the section called Nafnaþulur. Joseph S. Hopkins published research on this figure in 2012 suggesting she might be the unnamed sister-wife. Other divine pairs show similar differentiated naming patterns like Fjörgynn and Fjörgyn or Ullr and Ullinn. No source confirms Njörun as the actual name of Njörðr's wife. The hypothesis relies entirely on poetic convention rather than direct narrative evidence.