Christopher O'Neill

In August 2018, the Swedish Royal Court announced that the O'Neill family was moving to Florida.

Their daughter, Princess Leonore, was born in New York on 20 February 2014. Their second child, Prince Nicolas, was born in Stockholm on 15 June 2015. In February 2015, the Swedish Royal Court announced that the family had moved to Stockholm from New York. In May 2015, the Swedish Royal Court announced that O'Neill had moved to London in April. In Autumn 2015, several months after the birth of Prince Nicolas, the entire family moved to London, where O'Neill's business is located. On 9 March 2018, their second daughter, Princess Adrienne, was born at Danderyd Hospital, Stockholm.

The first time Princess Madeleine and O'Neill appeared publicly together was in January 2011. Their engagement was announced in an official interview on 25 October 2012, and in late April 2013 it was announced that their wedding would take place on 8 June 2013 at the Royal Chapel, Stockholm Palace, and be followed by dinner at the Swedish Royal Family's residence, Drottningholm Palace.

O'Neill was born in London to Paul O'Neill (d. 2004), an American investment banker who came to London in the 1960s to set up the European head office of Oppenheimer & Co. His mother is Eva Maria O'Neill (née Walter). O'Neill has two half-sisters on his mother's side: Tatjana d'Abo and Countess Natascha von Abensberg und Traun, and three on his father's side: Stefanie, Annalisa and Karen. He grew up in London, St. Gallen, Austria and Germany, and holds dual American and British citizenship.

Christopher Paul O'Neill, KNO (born 27 June 1974) is a British-American financier and husband of Princess Madeleine, Duchess of Hälsingland and Gästrikland, with whom he has three children. He did not take any titles or become a Swedish citizen; he could then continue as a businessman with no royal duties.