House Douglas of Lochleven
Cadet branch of the House Douglas of Dalkeith
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House Douglas of Lochleven
Lords of Lugton and Lochleven
Lords Aberdour
Earls of Morton
William Douglas of Lochleven succeeded as 6th Earl of Morton in 1588 -
House Douglas of Morton
Lords of Lugton and Lochleven
Lords Aberdour
Earls of Morton
Arms from 11th Earl of Morton onwards
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House Douglas of Tilquhillie
Lords of Tilquhillie Castle
Issued from David, 2nd son of Henry Douglas of Lochleven -
House Douglas of Buchan
Lords Auchterhouse and Cardross
Earls of Buchan
Issued from Robert, younger son of Robert Douglas of Lochleven and younger brother of William Douglas, 6th Earl of Morton -
House Douglas of Kirkness
Lords of Kirkness and Kinnesswood
Issued from Archibald, 3rd son of William Douglas, 6th Earl of Morton -
House of Douglas-Pennant
Lords of Penrhyn Castle
and Llandygai
Barons Penrhyn
Issued from John, younger son of James Douglas, 14th Earl of Morton
Assumed additional surname and arms of Pennant family as their successors
Welsh branch
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Robert Douglas
8th Earl of Morton
1648-1649 -
William Hew Douglas
Lord of Ardgour House
Major in the British Army
Great-grandson of Sholto Douglas, 19th Earl of Morton by his 4th son William