Various, Notes and Queries, Number 239, May 27…
“ Ballyportree Castle held out to the last, but at length it was taken after a fierce resistance, only three of the garrison being found alive, who proved to be a father and his two sons; the infuriated conquerors were about to kill them also, when one of then proposed that their lives should be spared, and a free passage to their own country given them, on condition that they taught the Irishmen how to brew the famous ale from the heather—that secret so eagerly coveted by the Irish, and so zealously guarded by the Danes. ”
