Like manannan, he conducted the souls of men to the Otherworld of the gods, and then brought them back to the human world.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
Thus, 'When Mongan was three nights old, manannan came for him and took him with him to bring up in the Land of Promise, and vowed that he would not let him back into Ireland before he were twelve years of age.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
manannan Mac Lir, tiring of his wife Fand, had deserted her, and so she, wishing to marry Cuchulainn, went to Ireland with her sister Liban.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz