Who married Prince Arsen of Yugoslavia?

Prince Arsenije "Arsen" of Yugoslavia (Serbian: Арсеније Карађорђевић / Arsenije Karađorđević; 16/17 April 1859 – 19 October 1938) was a dynast of the House of Karađorđević and ancestor of the current cadet branch of the Royal Family which ruled Yugoslavia until 1945. He long served as an officer in the Russian Imperial Army.

Aurora Pavlovna Demidova, Princess of San Donato (2/3 November 1873 in Kiev – 28 June (OS: 16 June) 1904 in Turin) was a Russian noblewoman and by birth a member of the House of Demidov.