The custom is mentioned (along with apples suspended on a string) in 18th century Ireland by Charles Vallancey in his book Collectanea de Rebus Hibernicis.
In 1787, the Chevalier O'Reilly returned it to Ireland; where it was at one stage in the possession of Charles Vallancey.
The island was later purchased by the British government in 1779 and Fort Westmoreland was developed on the site to designs by Charles Vallancey.
Irish antiquarian Charles Vallancey proposed that the name "lambswool" was a corruption of the name of a pagan Irish festival, "Lamas Ubhal", during which a similar drink was had.
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