In Norse mythology, Sigyn (Old Norse "victorious girl-friend") is a goddess and is the wife of Loki. Sigyn is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. In the Poetic Edda, little information is provided about Sigyn other than her role in assisting Loki during his captivity. In the Prose Edda, her role in helping her husband through his time spent in bondage is stated again, she appears in various kennings, and her status as a goddess is mentioned twice. Sigyn may appear on the Gosforth Cross and has been the subject of an amount of theory and cultural references.
Sigyn is attested in the following works:
In stanza 35 of the Poetic Edda poem Völuspá, a völva tells Odin that, amongst many other things, she sees Sigyn sitting very unhappily with her bound husband, Loki, under a "grove of hot springs". Sigyn is mentioned a second (and final) time in the ending prose section of the poem Lokasenna. In the prose, Loki has been bound by the gods with the guts of his son Nari, his son Váli is described as having been turned into a wolf, and the goddess Skaði fastens a venomous snake over Loki's face, from which venom drips. Sigyn, again described as Loki's wife, holds a basin under the dripping venom. The basin grows full, and she pulls it away, during which time venom drops on Loki, causing him to writhe so violently that earthquakes occur that shake the entire earth.