²⁵Cross, Tom Peete, and Clark Harris Slover. Ancient Irish Tales. New York: Barnes & Noble, 1936. 374
In one of the Fenian tales, "Fort of the Rowann Tree (Bruighion Chaorthainn), a poet puts Fionn Mac Cumhaill under a taboo in which he must answer this poetic riddle:

I saw a house in the country
Out of which no hostages are given to a king,
Fire burns it not, harrying spoils it not.

Fionn replies, "I understand that verse, for that is the Brugh of the Boyne that you have seen, namely, the house of Aengus Og of the Brugh, and it cannot be burned or harried as long as Aengus shall live." (Evans-Wentz, W. Y. The Fairy-faith in Celtic Countries,. London: H. Frowde, 1911 .410-416.)