Carstairs was created a Burgh of Barony in 1765 and planned and rebuilt by Henry Monteith, who purchased the
estate in 1819.from the Fullerton family; [reference:- Fullerton Family]
The third son, the Rev. William Fullarton, minister of St. Quivox, Ayrshire, acquired the lands of Craighall
from his cousin, John Fullarton of Dreghorn.
He married Frances, daughter of Stewart of Reece, Renfrewshire, a cadet of the Stewarts of Lennox, and had several
sons and daughters, and was ancestor of the Fullartons of Thrybergh Park, Yorkshire.
He was also the progenitor of the Fullartons of Carstairs in Lanarkshire, one of whom, Robert Fullarton,
was governor of Prince of Wales Island.
His heirs sold Carstairs to Henry Monteith Esq, He built himself a Tudor Gothic mansion, designed by
William Burn.
Which survives today -It has been a Hospital for mentally handicapped children named St Charles. In recent times
 it is now a Nursing Home for the elderly
 named Caledonian House which today,has been renamed Monteith House.
The village is essentialy as Henry Monteith planned. Surviving relatives and family of Henry Monteith
 live near the village today.
John Fullerton, second son of William Fullerton of Carstairs, passed advocate, 17th Feb. 1798, when in his 23rd year,
 and on the 17th Feb. 1829 he was elevated to the bench in the room of Lord Eldin, when he took the judicial title of
Lord Fullerton.
He died 3d Dec. 1853, about three weeks after resigning his seat on the bench