There was one son of the marriage, the crown prince Rudolph (1857-1889). A man of much ability and promise, he was a good linguist, and showed great interest in natural history. He published two works, _Fifteen Days on the Danube_ and _A Journey in the East_, and also promoted illustrated work giving a full description of the whole Austro-Hungarian monarchy; he personally shared the labours of the editorial work. In 1881 he merried Stephanie, daughter of the king of the Belgians. On 30th January 1889 he commited suicide at Mayerling, a country house near Vienna. He left one daughter, Elizabeth, who was betrothed to Count Alfred Windischgraetz in 1901. In 1900 his widow, the crown princess Stephanie, married Count Lonyay; by this she sacrificed her rank and position within the Austrian monarchy. Besides the crown prince the empress gave birth to three daughters, of whom two survive: Gisela (born 1857), who married a son of the prince regent of Bavaria; and Marie Valerie (born 1868), who married the archduke Franz Salvator of Tuscany. See J. Emmer. _Kaisser Franz Joseph_ (2 vols., Vienna, 1898); J. Schnitzer, _Franz Joseph I. und seine Zeit_ (2 vols., _ib._, 1899); _Viribis unitis. Das Buch vom Kaiser_, with introduction by J.A. v. Halfert, ed. M. Herzig (_ib._, 1898); R. Rostok, _Die Regierungszeit des K. u. K. Franz Joseph I._ (3rd ed. _ib._, 1903).