E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Thomas the Rhymer.
Thomas Learmont, of Ercildoune, a Scotchman, in the reign of Alexander III., and contemporary with Wallace. He is also called Thomas of Erchdoune. Sir Walter Scott calls him the Merlin of Scotland. He was magician, prophet, and poet, and is to return again to earth at some future time when Shrove Tuesday and Good Friday change places.
Care must be taken not to confound Thomas the Rhymer with Thomas Rymer, the historiographer and compiler of the Fdera.