Was Andersen "The Little Mermaid" his untested story, or purely interpretation?

I know, that, for example, Grimm brothers' books are not original stories, but collection of old German tales...

I am curious, how is it beside Little Mermaid? Did Andersen write it by himself or was he inspired by some old Danish tale?
Answers:
My mom said that be the original one...the danish tale.

I was pretty disturbed when i hear the real version of the little mermaid.

Why did she have to explain to a 5 year old me... >_<
"The Little Mermaid" is Andersen's own original story. However, there be water spirits in older European mythology, and one group of them, known as Undines, were said to be able to gain a soul by marry a man and bearing his child. Andersen's tale was probably inspired by that fable.


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