Princess Märtha of Sweden
Princess Märtha of Sweden was Crown Princess of Norway as the wife of the future King Olav V from 1929 until her death in 1954. As Olav only became king in 1957, Märtha never became Queen of Norway. Her son, Harald V, was King of Norway from 1991 until his death in 2026. Princess Märtha was also an elder sister of Queen Astrid of Belgium and a maternal aunt of Grand Duchess Joséphine-Charlotte of Luxembourg and Kings Baudouin and Albert II of Belgium.
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