Gastropnir is featured in Fjölsvinnsmál, as Svipdag conducts his mission to reach Menglöð. Svipdag walking up to the gate in the wall where he addresses a watchman called Fjölsviður. In the exchange between two, Svipdagr asks what the wall is called. Fjolsvith replies that it is called Gastropnir and adds that he built it out of Leirbrimir's limbs.
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