The elder sister of David Bowes-Lyon married a prince who was the last Emperor of what country?
David Bowes-Lyon Sir David Bowes-Lyon KCVO (2 May 1902 – 13 September 1961) was the sixth son of Claude Bowes-Lyon, 14th Earl of Strathmore and Kinghorne, and Cecilia Nina Cavendish-Bentinck as well as their tenth and youngest child. His elder sister Lady Elizabeth Bowes-Lyon married Prince Albert, Duke of York, the second son of King George V, in 1923 and became Queen Consort of the United Kingdom after the abdication of her husband's elder brother Edward VIII on 11 December 1936.
Ernest I, Duke of Saxe-Coburg and Gotha Ernest I (German: "Ernst Anton Karl Ludwig Herzog" ; 2 January 1784 – 29 January 1844) was the last sovereign duke of Saxe-Coburg-Saalfeld (as Ernest III) and, from 1826, the first sovereign duke of Saxe-Coburg and Gotha (as Ernest I). He was the father of Albert, Prince Consort of Queen Victoria and is thus a patrilineal ancestor and great-great-great-grandfather of Queen Elizabeth II. Ernest fought against Napoleon Bonaparte and through construction projects and the establishment of a court theatre left a strong imprint on his residence town, Coburg.