William Douglas, 6th Earl of Morton Scottish Earl (1540–1606) Parents Margaret Erskine Sir Robert Douglas of Lochleven Children Robert Douglas, Master of Morton Lady Elizabeth Douglas Agnes Douglas, Countess of Argyll Lady Margaret Douglas Lady Mary Douglas Lady Eupheme Douglas Sir Archibald Douglas of Keillor James Douglas Sir George Douglas, 1st of Kirkness and Kynnesswood Lady Christian Douglas Lady Jean Douglas Siblings Euphemia Douglas James Stewart, 1st Earl of Moray Catherine Douglas Janet Douglas Robert Douglas, 4th Earl of Buchan Sir George Douglas Partners Agnes Leslie, Countess of Morton