Cú Chulainn is a legendary hero from Irish mythology, known for his incredible strength and martial skills. He is often associated with the Ulster Cycle, a collection of tales that highlight the heroic deeds of warriors in ancient Ireland. Cú Chulainn is famous for his single-handed defense of the kingdom of Ulster against invading armies. His most notable feat is the "Cattle Raid of Cooley," where he battles the forces of Connacht to protect the prized brown bull of Cooley. Cú Chulainn is also recognized for his unique battle frenzy, known as the "ríastrad," which transforms him into a fearsome warrior.