Gods and Fighting Men, by Lady Gregory, , at sacred-texts.com
BUT as to the Tuatha de Danaan after they were beaten, they
would not go under the sway of the sons of Miled, but they went
away by themselves. And because Manannan, son of Lir, understood
all enchantments, they left it to him to find places for them
where they would be safe from their enemies. So he chose out the
most beautiful of the hills and valleys of Ireland for them to
settle in; and he put hidden walls about them, that no man could
see through, but they themselves could see through them and pass
through them. And he made the Feast of Age for them, and what
they drank at it was the ale of Goibniu the Smith, that kept
whoever tasted it from age and from sickness and from death. And
for food at the feast he gave them his own swine, that though
they were killed and eaten one day, would be alive and fit for
eating again the next day, and that would go on in that way for
ever. And after a while they said: "It would be better for us
one king to be