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.
Isabel Moctezuma Doña Isabel Moctezuma (born Tecuichpoch Ixcaxochitzin; 1509/1510 – 1550/1551) was a daughter of the Aztec ruler Moctezuma II. She was the consort of the Aztec emperors Cuitláhuac and Cuauhtémoc and as such the last Aztec empress. After the Spanish conquest, Doña Isabel was recognized as Moctezuma's legitimate heir, and became one of the Mexican Indians granted an "encomienda." Among the others were her half-sister Marina (or Leonor) Moctezuma, and Juan Sánchez, an Indian governor in Oaxaca.