Prince Karl of Leiningen Prince of Leiningen (1928–1990) (1928–1990) Parents Grand Duchess Maria Kirillovna of Russia Karl, 6th Prince of Leiningen Children Hermann Leiningen Prince Boris of Leiningen Siblings Princess Margarita of Leiningen Emich, 7th Prince of Leiningen Princess Kira Melita of Leiningen Prince Peter of Leiningen Prince Friedrich of Leiningen Princess Mechtilde of Leiningen Partners Princess Maria Luisa, 9th Princess of Koháry