The estate was sold to Civil War General George Barclay in 1855 .
The estate was was later inherited by his son - in - law Francis Robert Rives who made many modifications to the Carnwath Manor and also constructed the carriage house , cow barn and ice house .
The estate was sold to Civil War General George Barclay in 1855 and was later inherited by his son - in - law Francis Robert Rives who made many modifications to the Carnwath Manor and also constructed the carriage house , cow barn and ice house .