Queen Silvia of Sweden Queen Silvia of Sweden is the spouse of King Carl XVI Gustaf and mother of the heir apparent to the throne, Crown Princess Victoria. In 2011, Silvia became the longest-serving queen of Sweden, a record previously held by Sophia of Nassau. Mette-Marit, Crown Princess of Norway Mette-Marit, Crown Princess of Norway is the wife of Crown Prince Haakon, heir apparent to the throne of Norway. Frederick IX of Denmark Frederick IX was King of Denmark from 1947 to 1972. Princess Benedikte of Denmark Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg is the second daughter and child of King Frederick IX and Queen Ingrid of Denmark. She is the younger sister of the reigning Queen of Denmark, Margrethe II, and the older sister of Queen Anne-Marie of Greece. Queen Anne-Marie of Greece Queen Anne-Marie of Greece, RE is the wife of King Constantine II, who reigned from 1964 until 1973. Ingrid of Sweden Ingrid of Sweden was Queen of Denmark from 1947 until 1972 as the wife of King Frederick IX. Queen Mathilde of Belgium Queen Mathilde of Belgium is the wife of King Philippe, who ascended the throne following the abdication of his father, King Albert II, on 21 July 2013. She is the first Belgian-born Queen of the Belgians. Prince Joachim of Denmark Prince Joachim of Denmark, Count of Monpezat, is the younger son of Queen Margrethe II and Prince Henrik. Joachim is sixth in the line of succession to the Danish throne, following his elder brother, Crown Prince Frederik, and Frederik's four children. Frederik, Crown Prince of Denmark Frederik, Crown Prince of Denmark, Count of Monpezat, is the heir apparent to the throne of Denmark. Frederik is the elder son of Queen Margrethe II and the late Henrik, Prince Consort. Princess Astrid, Mrs. Ferner Princess Astrid, Mrs. Ferner is the second daughter of King Olav V of Norway and his wife, Princess Märtha of Sweden. She is the older sister of King Harald V of Norway and younger sister of the late Princess Ragnhild. Mary, Crown Princess of Denmark Mary, Crown Princess of Denmark, Countess of Monpezat, is the wife of Frederik, Crown Prince of Denmark. Frederik is the heir apparent to the throne, which means that should Frederik succeed, she will automatically become Queen of Denmark. Princess Margaretha, Mrs. Ambler Princess Margaretha, Mrs. Ambler, is a Swedish princess, the eldest sister of King Carl XVI Gustaf of Sweden and also first cousin of Queen Margrethe II of Denmark. Princess Désirée, Baroness Silfverschiöld Princess Désirée, Baroness Silfverschiöld is the third child of Prince Gustaf Adolf, Duke of Västerbotten, and Princess Sibylla of Saxe-Coburg and Gotha, and granddaughter of King Gustaf VI Adolf of Sweden. Her younger brother is King Carl XVI Gustaf of Sweden. Princess Christina, Mrs. Magnuson Princess Christina, Mrs. Magnuson, is the youngest of four older sisters of King Carl XVI Gustaf of Sweden. She generally uses the name Christina Magnuson. Richard, 6th Prince of Sayn-Wittgenstein-Berleburg Richard, 6th Prince of Sayn-Wittgenstein-Berleburg was the head of the House of Sayn-Wittgenstein-Berleburg and husband of Princess Benedikte of Denmark. Princess Marie of Denmark Princess Marie of Denmark, Countess of Monpezat, is the second wife of Prince Joachim of Denmark. Princess Joséphine Charlotte of Belgium Princess Joséphine Charlotte of Belgium was Grand Duchess consort of Luxembourg as the wife of Grand Duke Jean. She was a first cousin of Harald V of Norway. She was the first child of King Leopold III of Belgium, and sister of the late King Baudouin I and former King Albert II and aunt of King Philippe I.