Count Claus-Casimir of Orange-Nassau, Jonkheer van Amsberg (Claus-Casimir Bernhard Marius Max; born 21 March 2004), is the second child of Prince Constantijn and Princess Laurentien of the Netherlands and their only son.
He is a member of the Dutch Royal Family and is sixth in the line of succession to the Dutch throne.His birth was overshadowed by the death, only a day before, of his great-grandmother, the former Queen Juliana.
He is the only grandson of Queen Beatrix and her husband, Claus von Amsberg.
He has two sisters: Countess Eloise, born 8 June 2002 and Countess Leonore, born 3 June 2006.
His christening took place in the chapel of Het Loo Palace in Apeldoorn on 10 October 2004.
Claus-Casimir's godparents are King Willem-Alexander, Prince Maurits of Orange-Nassau, van Vollenhoven, Ed P.
Spanjaard, and Countess Tatiana Razumovsky von Wigstein.