What is the legend behind finding a pot of gold with a leprechaun at the end of a rainbow?

The legend of finding a pot of gold with a leprechaun at the end of a rainbow comes from Irish folklore. Leprechauns are mischievous fairies known for hiding their pots of gold at the end of rainbows. The belief is that if you catch a leprechaun, they will grant you three wishes in exchange for their freedom. This myth has been popularized in stories and traditions, especially around St. Patrick's Day.