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The Duke and Duchess of Argyll, late 19th or early 20th century. Princess Louise (1848-1939), the fourth daughter of Queen Victoria, married John Campbell, 9th Duke of Argyll (1845-1914), on 21st March 1871. (Photo by The Print Collector/Print Collector/Getty Images)

The Duke and Duchess of Argyll, late 19th or early 20th century. Princess Louise (1848-1939), the fourth daughter of Queen Victoria, married John Campbell, 9th Duke of Argyll (1845-1914), on 21st March 1871. (Photo by The Print Collector/Print Collector/Getty Images)