The vitrified fort on Knock-Farril, in Ross-shire, is said to have been one of Fin McCoul’s castles;[32] and Knock-Farril, or rather “a knoll opposite Knock-Farril” is remembered as the abode of the Fairies of that district.[33]
[32] Proceedings of Society of Antiquaries of Scotland, vol. vii. p. 294, note.
[33] See, for example, an article on “Scottish Customs and Folk lore,” in The Glasgow Herald of August 1, 1891
From ‘Fians, Fairies and Picts’, by David MacRitchie, 1893.
The book is online at Project Gutenberg
gutenberg.org/files/17926/17926-h/17926-h.htm#Footnote_32_32