Selkirk, Lord Malcolm Douglas-Hamilton, and Lord David Douglas-Hamilton made history by all being squadron leaders or above at the outbreak of the war. Lord David Douglas-Hamilton was killed in action in 1944. The 14th Duke of Hamilton was the first man to fly over Mt. Everest. His son, Angus Douglas-Hamilton, 15th Duke of Hamilton was also in the Royal Air Force and achieved the rank of flight lieutenant during his service in the Cold War. He was the father of the current Duke, Alexander Douglas-Hamilton, 16th Duke of Hamilton. The current heir apparent to the Dukedom is the 16th Duke's son, Douglas Charles Douglas-Hamilton, Marquess of Douglas and Clydesdale. The Swedish branch The lineage of the Swedish branch of the Douglas of Dalkeith line begins with James Douglas, documented in 1353, died in 1420. His descendant Sir William Douglas of Whittingehame (which had come from the Earls of March by marriage to James Douglas of Dalkeith in 1372) became English ambassador to the royal Danish court at Copenhagen in 1603. His grandson, the Scottish-born Robert Douglas (1611–1662), transplanted this branch of the Scottish clan to Sweden when in 1627 he became an officer in the Thirty Years' War; In 1657 he became field marshal. He received the Swedish title of Baron in 1651 and the title of Count (the highest title awarded to non-royalty in Sweden) in 1654. He was enfeoffed with the county of Skänninge and introduced in 1654 to the class of counts of the Swedish nobility under No. 19. From 1655 he built Stjärnorp Castle in Östergötland, which is still an ancestral seat of the Swedish branch today, besides Ekensholm Castle and Rydboholm Castle. The escutcheon of the Swedish Douglas family's arms is the Scottish Douglas arms. Robert Douglas' descendants, the Swedish counts Douglas (the title is not primogenous, but is held by all members of the line), are one of Sweden's most prominent noble families since the mid 17th century and has included numerous prominent individuals, such as Foreign Minister Ludvig Douglas. Count Gustaf Douglas is an important entrepreneur. His sisters are Rosita Spencer-Churchill, Duchess of Marlborough, and Princess Elisabeth, Duchess in Bavaria, the wife of Prince Max, Duke in Bavaria. Walburga Habsburg, Countess Douglas, the daughter of Austria-Hungary's last crown prince, is a member of this family by her marriage to Count Archibald Douglas. Through a marriage in 1848 to Countess Louise von Langenstein und