Prince Constantin of Saxe-Weimar-Eisenach (b. 1977), only son of Prince Wilhelm Ernst of Saxe-Weimar-Eisenach (b. 1946) (son of Prince Bernhard of Saxe-Weimar-Eisenach [1917-1986] and his former wife Princess Felicitas of Salm-Horstmar [b. 1920]) and his former wife Eva Katharina Kovarcz de Kovarczfalva,
married Olivia Rachelle Page (b. 1979) this year.
Constantin is the younger of two children and second to marry. His sister Désirée (b. 1974) is married to Count Florian von und zu Hoensbroech and has five children.
Source:
Descendants of King Willem I of the Netherlands