Princess Viggo, Countess of Rosenborg (née Eleanor Margaret Green; 5 November 1895 – 3 July 1966) was an American who became a Princess in Denmark.

[1] Green married Prince Viggo of Denmark, Viggo Christian Adolph George, son of Prince Valdemar of Denmark and Princess Marie Amélie Françoise Hélène d'Orléans, on June 10, 1924, in New York City.

[2][3][4] Without the legally required permission of the Danish king for a dynastic marriage, Prince Viggo renounced his place in Denmark's line of succession to the Crown, his title of Prince of Denmark, and his style of Royal Highness as was customary in the Danish royal house upon marriage to a commoner.

In connection with the marriage and her husband's new title, Eleanor Margaret Green became Her Highness Princess Viggo, Countess of Rosenborg.

[citation needed] Prince and Princess Viggo had no children.