The Robertouns were feudal Lairds of Earnock from prior to 1226 – 1296 and 1390 - c 1700. ( The family were dispossessed for signing the Ragman Roll (Rampant Scotland). Simon Robertoun regained Earnock through marriage to a daughter of David fitz Walter of Cadzow (Beverage nd) (Nesbitt A nd) ). It was sold by James Roberton, 12th Laird of Earnock, to a Mr Semple at the turn of the 19th century. He in turn sold the property to A. Millar, Esq., in 1810.