The elder sister of David Bowes-Lyon married a prince who was the last Emperor of what country?
George VI George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death. He was the last Emperor of India and the first Head of the Commonwealth.
Infanta Mariana Victoria of Portugal Mariana Victoria of Portugal (or of Braganza; Portuguese: Mariana Vitória; full name: "Mariana Vitória Josefa Francisca Xavier de Paula Antonieta Joana Domingas Gabriela de Bragança"; ] or [mɐˈɾiɐ ˈɐnɐ viˈtɔɾiɐ ʒuˈzɛfɐ] ; 15 December 1768 – 2 November 1788) was a Portuguese "Infanta" (princess), the eldest daughter of Queen Maria I of Portugal and her king-consort, Infante Pedro of Portugal.