Glencairn is an ancient sacred site, as there has been a church here since at least the 10th century and in the 12th century the church here dedicated to St Cuthbert, who was said to have visited and worshipped at the site in the 7th century. The present church dates to 1836. Some Earls of Glencairn are buried in churchyard. Four memorials to Covenanters are found in the churchyard and the Craigdarroch Mausoleum dates to 1685. Either side of the mausoleum are yews, with form and size suggesting they may be contemporary with the mausoleum and around 300 years old. Other smaller yews next to the main entrance of the churchyard are probably linked to the building of the present church.