High Quality Content by WIKIPEDIA articles! Angus Alan Douglas Douglas-Hamilton, 15th Duke of Hamilton and 12th Duke of Brandon (13 September 1938 – 5 June 2010) was the premier peer of Scotland. He was styled Earl of Angus between 1938 and 1940, and Marquess of Douglas and Clydesdale between 1940 and 1973, and from then was styled His Grace The Duke of Hamilton and Brandon.