Carl Gustaf Oscar Fredrik Christian, Prince Bernadotte, originally Prince Carl, Duke of Östergötland, was the youngest child and only son of Prince Carl of Sweden and Princess Ingeborg of Denmark and eventually a prince of the Belgian nobility. To distinguish himself from his father, he was widely known as Carl Junior. He was the brother of Princess Margaretha of Sweden, Queen Astrid of Belgium and Crown Princess Märtha of Norway.

Louise of Sweden was Queen of Denmark from 1906 until 1912 as the wife of King Frederick VIII.