Who married Prince John Constantinovich Of Russia?

Princess Jelena of Yugoslavia married Prince John Constantinovich Of Russia on August 21, 1911. Prince John Constantinovich of Russia was 25 years old on the wedding day (25 years, 1 months and 16 days). Princess Jelena of Yugoslavia was 26 years old on the wedding day (26 years, 9 months and 17 days). The age gap was 1 years, 8 months and 1 days.