Charles Richard John Spencer-Churchill (November 13, 1871–June 30, 1934) became the 9th Duke of Marlborough upon the death of his father in 1892. He was often known as “Sunny” Marlborough after his courtesy title of the Earl of Sunderland, which he held until 1883. He was a first cousin of Winston Churchill. On November 6, 1895, he married the American railroad heiress Consuelo Vanderbilt, at Saint Thomas Church in New York City. They had two sons, John Albert Edward William...