True Thomas and the Queen of Elfland
An old romance in verse by Thomas the Rhymer.
Thomas the Rhymer was so called from his prophecies, the most noted
of which was the prediction of the death of Alexander III. of Scotland,
made to the Earl of March in the Castle of Dunbar the day before it
occurred. It is recorded in the Scotichronicon of Fordun.
(1430.) (See Rhymer.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on True Thomas and the Queen of Elfland from Infoplease: