Prince Karl Emich of Leiningen

http://genealogics.org/getperson.php?personID=I00031313&tree=LEO

He married Countess Isabelle of Egloffstein in a civil ceremony on 8 September 2007 in Amorbach, and in a religious ceremony on 7 June 2008 in Pappenheim.

https://en.wikipedia.org/wiki/Prince_Karl_Emich_of_Leiningen

Prince Karl Emich of Leiningen (born Karl Emich Nikolaus Friedrich Hermann Prinz zu Leiningen; June 12, 1952) is the eldest son of Emich, 7th Prince of Leiningen and his wife Duchess Eilika of Oldenburg, and is an elder brother of Andreas, 8th Prince of Leiningen. He is a claimant to the defunct throne of the Russian Empire, held until 1917 by the Imperial House of Romanov, as a grandson of Grand Duchess Maria Kirillovna (1907-1951), eldest child of Grand Duke Kirill Vladimirovich, who claimed the Russian crown from exile in 1924. He is a great-great-grandson of Emperor Alexander II of Russia and grand nephew of Grand Duke Vladimir Kirillovich of Russia.

In 2013, the Monarchist Party of Russia declared him the primary heir to the Russian throne upon his conversion from Lutheranism to Eastern Orthodox Christianity, and in 2014 announced the formation of the Imperial Throne, wherein Karl Emich had agreed to assume imperial dignity as Emperor Nicholas III.