The "Pied Piper of Hamelin" is a famous legend from the town of Hamelin in Germany. According to the story, in the year 1284, the town was plagued by a massive infestation of rats. To solve this problem, a mysterious piper appeared, offering to rid the town of the vermin in exchange for a fee. The piper played his magical flute, luring the rats into the river, where they drowned. However, when the townspeople refused to pay him, the piper sought revenge by using his music to lead away the town's children. This tale serves as a cautionary story about the importance of keeping promises.