Dreghorn (site of)
There is likely to have been a castle at Dreghorn although its exact location has now been lost.
In 1330 Sir Alan Stewart of Dreghorn was granted licence by his cousin, Robert, 7th High Steward of Scotland (the future Robert II), to purchase the lands of Crukysfu. Sir Alan died at the Battle of Halidon Hill in 1333 and was succeeded by his son, Sir John Stewart, who in a charter in his favour granted by Robert, 7th High Steward, was styled as Sir John Stewart, Lord of Crookston, Knight.
The fortalice of Drehorne was mentioned in a grant to Hugh Montgomerie, 3rd Earl of Eglinton, in 1565.
I have placed the site of the castle at the location of the medieval village of Dreghorn pending further research.
Alternative names for Dreghorn
Dregarn; Dregarne; Dregerne; Dreghorne