The forest of Dooros was in the district of Hy Fiera of the Moy (now the barony of Tireragh, in Sligo).

On a certain occasion the Dedanns, returning from a hurling match with the Feni, passed through the forest, carrying with them for food during the journey crimson nuts, and arbutus apples, and scarlet quicken-berries, which they had brought from the Land of Promise. One of the quicken-berries dropped on the earth, and the Dedanns passed on not heeding.

From this berry a great quicken-tree sprang up, which had the virtues of the quicken-trees that grow in fairyland. Its berries had the taste of honey, and those who ate of them felt a cheerful glow, as if they had drunk of wine or old mead, and if a man were even a hundred years old he returned to the age of thirty as soon as he had eaten three of them.

The Dedanns having heard of this tree, and not wishing that anyone should eat of the berries but themselves, sent a giant of their own people to guard it, namely, Sharvan the Surly, of Lochlann.––“The Pursuit of Diarmuid and Grania,” “Old Celtic Romances,” p. 313 (Joyce).