Ludwig married Caroline Emilie Louise Valerie Stephanie Radziwill on June 14, 1828 in Saint Petersburg, Russia. Caroline (daughter of Prince Domink Hieronim Radziwill (maid. name (1er Regt Chevau-legers lanciers de la garde imperiale)) and Princess Teofila of Morawski) was born on 9 Dec 1809 in Paris, Paris, Île-de-France, France; died on 26 Jul 1832 in Bad Ems, Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany. [Group Sheet] [Family Chart]

1. Marie Antoinette Caroline Stephanie of Sayn-Wittgenstein was born on 16 February 1829 in Saint Petersburg, Russia; died on 21 Dec 1897 in Berlin, Germany.
2. Peter of Sayn-Wittgenstein (maid. name 2nd Prince of Sayn and Wittgenstein) was born on 10 May 1831 in Firenze, Toscana, Italy; died on 20 Aug 1887 in Kerleon.