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CĂș Chulainn, in medieval Irish literature, the central character of the Ulster (Ulaid) cycle. He was the greatest of the Knights of the Red Branch—i.e., the warriors loyal to Conor (Conchobar mac Nessa), who was reputedly king of the Ulaids of northeast Ireland at about the beginning of the 1st century bce. CĂș Chulainn, born as SĂ©tante, the son of the god Lug (Lugh) of the Long Arm and Dechtire, the sister of Conor, was...