Jarnsaxa
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In Norse mythology, Jarnsaxa was a Jotun and Thor's lover. By him, she was the mother of Magni.
Jarnsaxa was not the mother of Thrud and Modi; Sif was their mother.
The Icelandic poet Snorri Sturluson (1179-1241) was considering that Sif and Jarnsaxa were the same goddess.