This document summarizes a legend about the devil Boruta from Polish folklore. Boruta was originally a poor forester who was rewarded with riches and nobility by King Carmir for helping him escape a swamp. However, Boruta became conceited in his new status. After death, he went to hell but was cunning enough to become the lord of all Polish devils. Boruta now resides in the ruins of his castle in the town of Łęczyca and is depicted in different forms guarding the castle's treasures and misleading travelers. The legend explains the origins of Boruta and his enduring presence around Łęczyca in Polish folk beliefs.