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From Fb site Celtic Mythology: FRAGARACH the 'Answerer' or 'Retaliator' was the sword of Manannan mac Lir and later, Lugh Lamfada. Forged by the gods, Manannan wielded it as his weapon before passing it on to Lugh, his foster son. It was given to Cúchulainn by Lugh, and later to Conn of the Hundred Battles. It was said that no one could tell a lie with Fragarach at his or her throat, thus the name 'Answerer'.