Francis II of France
As a child, Mary Seton became a lady-in-waiting to the young Mary, Queen of Scots, along with three other girls of similar age and of a similar standing in Scots society. They were famously known as "The Four Marys": she and Mary Beaton, Mary Fleming and Mary Livingston. The Four Marys accompanied Queen Mary in France, where she later married the Dauphin, Francis II of France. Mary Seton was the only one of the four not to marry, and continued in service with Mary, in Scotland and during her captivity in England.