William Cavendish-Bentinck
William John Arthur Charles James Cavendish-Bentinck, 6th Duke of Portland, (28 December 1857 – 26 April 1943), known as William Cavendish-Bentinck until 1879, was a British landowner, courtier, and Conservative politician. He notably served as Master of the Horse between 1886 and 1892 and again between 1895 and 1905.