JOHN DUKE, of Calvert and St. Mary's Counties, Maryland ; b. circa 1734-1735 ; d. after 1780 ; owing to the complete destruction by fire of all the official County, State and Church records of Calvert and St. Mary's Counties, there is no evidence other than family history of John Duke ; it is known he had three sons, two of whom James and Basil remained in Calvert County, while he removed to St. Mary's County, where he married. ...