Something I’ve been wondering, lately: while Loki’s parentage is Laufey and Farbauti, there is no information whatsoever (that I’ve come across, at least) about Sigyn’s background. I remember one of the first books I read about Norse mythology said something along the lines of, “when Loki came to…
The only original references we have of Sigyn are a handful of sentences in the Prose Edda (I found two translations of the texts available online, one by Brodeur, and one by Bellows) and an engraving on the Gosforth Cross, which is exactly what it sounds like — a large stone cross in a churchyard in Gosforth.
From those two sources, the only thing we know for sure about Sigyn is that
- she’s stated to be a goddess a couple times in the Prose Edda, but it’s not described in detail exactly what she’s a goddess of (the whole fidelity thing was something that Marvel came up with)
- she’s Loki’s wife and had two kids with him - Narvi/Narfi and Vali (one kid got turned into a wolf and killed his brother, but even the original myths get confused as to which kid did what)
- she’s featured in the story of Loki’s binding and punishment
- she has quite a few kennings
That’s it. Everything else is literally just headcanons and speculation, even things written down in proper stories and books. If you want the most accurate headcanons and speculations, I suggest reading what actual, well-educated pagans have to say about her, seeing as this is their religion and all. For starters, I found an online shrine dedicated to Sigyn, which has some interesting things to say about her and her children. There’s also a video on YouTube that I liked, but I’ve gone and forgotten what it’s called so that’s not really helpful to you at all.