King Ailill is a character from Irish mythology, known primarily from the epic tales of the Táin Bó Cúailnge. He is the king of Connacht and is often depicted as a powerful and ambitious ruler, seeking to expand his kingdom's influence. Ailill is married to Queen Medb, and together they are central figures in the story of the cattle raid against Ulster. His character embodies themes of leadership, rivalry, and the complexities of power in ancient Irish society.