Who were the Viking shield-maidens, legendary female warriors

Aside from the more "traditional" roles that many women received in Viking societies, some were said to have been fierce warriors who took up arms. Who were the Viking shield-maidens, these Nordic s?

Shield-maiden

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Shieldmaiden Collections for sale Viking warrior woman costume - store :: Armstreet

Shield-maiden

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Lagertha and the History of Shield Maidens – Sons of Vikings