- William Douglas, 1st Marquess of Douglas
William Douglas, 1st Marquis of Douglas and 11th Earl of Angus (1589-1660) was the eldest son of
William Douglas, 10th Earl of Angusand Countess Elizabeth, eldest daughter of Laurence Oliphant, 4th Lord Oliphant. [ [http://www.thepeerage.com/p10942.htm#i109418 "William Douglas, 1st Marquess of Douglas"] at thePeerage.com] His brothers, both younger, were James Douglas, 1st Lord Mordingtonand Francis Douglas. [ [http://www.thepeerage.com/p10952.htm#i109515 "William Douglas, 10th Earl of Angus"] at thePeerage.com]
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