A Thrummy-cap is a character in Scottish folklore, that appears in many tales. It may have been invented by John Burness in his 1796 Thrummy Cap, A Legend of the Castle of Fiddes. The poetic tale, Thrummy Cap, A Legend of the Castle of Fiddes (1796), written by John Burness (cousin of Robert Burns), was popular during the 19th century in the northeast of Scotland - it may be that Burness invented the legend. The name of the tale "Thrummy Cap" holds the name of one of its protagonists. Thrummy Cap encounters a ghost identical to himself (see also Doppelganger). This ghost shows Thrummy where the castle deeds are, which he had stolen from the Laird. This tale employs the restless ghost motif.