(This post is adapted from material in my new book on Njord and Skadi.)
One of the great puzzles of Norse mythology is the problem of Nerthus and Njord. The Germanic goddess Nerthus, whose cult is described by the Roman historian Tacitus, in the first century AD, is not attested in any other source, but her name is linguistically the same as that of the Scandinavian sea-god Njord, who appears in sources roughly 1 000 years later.
Since Snorri tells us in the Ynglinga saga that Njord had a sister who was his wife, the mystery seemed solved: Nerthus was his sister, just as Freyja was Freyr’s.
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