"The Little Mermaid" (Danish: Den lille havfrue) is a fairy tale by the Danish poet and author Hans Christian Andersen about a young mermaid willing to give up her life in the sea and her identity as a mermaid to gain a human soul and the love of a human prince.
Written originally as a ballet, the tale was first published in 1837 and has been adapted to various media including musical theatre and later stolen by Disney for an animated film.
Omg, all these mermaid threads. Yes, TLM was a fairytale from back in the 1800s, and no one stole it, not really, they just did their own version in animation.