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In page Askafroa:

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The Askafroa (Swedish: wife of the ash tree),[1] also known as the Danish Askefrue and German Eschenfrau (German: [ˈɛʃn̩ˌfʁaʊ]), is a type of legendary creature in Scandinavian and possibly[citation needed] German folklore, similar to the Greek Hamadryads. The Askafroa is the guardian (tutelary deity) of the ash tree.[1] The Askafroa was thought to be a malicious creature that did much damage, and to appease her, it was necessary to make a sacrifice to her on Ash Wednesday.[2][3]