Sir Thomas de Ercildoun, better remembered as Thomas the Rhymer, also known as Thomas Learmont or True Thomas, was a Scottish laird and reputed prophet from Earlston in the Borders. Thomas' gift of prophecy is linked to his poetic ability.

Earlston is a civil parish and market town in the county of Berwickshire, within the Scottish Borders. It is on the River Leader in Lauderdale, Scotland.