Rhymer.
Thomas the Rhymer. Thomas Learmount, of Ercildoune, who lived in the thirteenth century. This was quite a different person to Thomas Rymer, the historiographer royal to William III. (who flourished 1283). (See True Thomas.)
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.