I believe that the Lockharts of Lee were staunchly Jacobite, at least during the civil war of the 17th century, as they certainly fought on the royalist side. I've no idea when Cleghorn would have been raised to the status of a barony, but my guess is that it could have been as late as the reign of Charles I (1625-1649). Likewise, I have no idea when the barony may have passed from the Lockharts... such are the vicissitudes of life.