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In Norse mythology, Járnsaxa (IPA: /jɑrnˈsæksə/, Old Norse "iron-sax") is a giantess. According to Snorri Sturluson's Prose Edda, she was Thor's lover. By him she was the mother of Magni. According to the Poetic Edda poem Hyndluljóð, Járnsaxa is the name of one of the mothers of Heimdall. Heimdall's nine mothers were the daughters of Ægir and Rán.