Manannan mac Lir is likely the most prominent sea deity of Irish mythology and literature. With his sea-borne chariot, affiliation with horses and cloak of invisibility, he guards the otherworld and the afterlife, incorporating aspects of the ancient Greek gods Poseidon and Hades. Manannán can also be associated with the Arthurian land of eternal youth, Avalon (Tír na nÓg in Celtic mythology), because his Irish daughter Niamh is one of the queens of this realm and his Welsh son Bran the Blessed possesses the cauldron a rejuvenation, not unlike the mythical Holy Grail. Manannán is also a popular character on the Isle of Man and a similar version of him is widespread in Wales. This prevalent appreciation and adoption of
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