1972-1973: Anne-Marie was the exiled queen of Greece, during the first year of her eldest sister's reign as Margrethe II of Denmark, the country's first queen regnant in 600 years. The Greek monarchy was abolished in 1973, two years before Juan Carlos was called to the Spanish throne as king, following the death of Generalissimo Francisco Franco. It was then that King Constantine II's sister Sofia became queen. But that example doesn't count, since their reigns never overlapped.
1964-1993: Baudouin was the king of the Belgians while his sister Josephine-Charlotte was the grand duchess consort of Luxembourg
1993-2000: Josephine-Charlotte was the grand duchess consort of Luxembourg, while her brother Albert II was the king of the Belgians
1913-1918: Kaiser Wilhelm II sat on the German imperial throne, while his sister Sophie was the queen consort of Greece
1881-1894: Dagmar was the empress consort of Russia (Maria Feodorovan), while her brother George I was the king of Greece
1906-1910: George I was the king of Greece while his older brother Frederik VIII was the king of Denmark; also, their sister Alexandra was the queen consort of Great Britain
1910-1936: George V was the king of Great Britain, while his sister Maud was the queen consort of Norway
1912-1947: Christian X was the king of Denmark while his brother Haakon VII was the King of Norway
1894-1917: Ernst was the reigning grand duke of Hesse-Darmstadt while his sister Alix was the empress consort of Russia
1848-1862: Maximilian II was the king of Bavaria, while his brother Otto was the king of Greece
1859-1861: Elisabeth was the empress of Austria-Hungary, while her sister Marie Sophie was the queen of the Two Sicilies
Can anybody fill me in on additional examples within the last 200 years? I'm less familiar with the smaller German houses.
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