In 1751 Calvert inherited a 4000 acres plantation known as Mount Airy, Yentsch, Anne E, p.261, A Chesapeake Family and their Slaves: a Study in Historical Archaeology, Cambridge University Press (1994) Retrieved Jan 2010 originally a hunting lodge for his great-grandfather Charles Calvert, 3rd Baron Baltimore, Yentsch, Anne E, p.262, A Chesapeake Family and their Slaves: a Study in Historical Archaeology, Cambridge University Press (1994) Retrieved Jan 2010 near Upper Marlboro in Prince George's County, Maryland, where he grew tobacco. [