Princess Catherine Dolgoruki (or Dolgoruky, or Dolgorukaya), also known as Princess Ekaterina Michielovna Dolgorukaya and Princess Catherine Yourievska, was the daughter of Prince Micheal Dolgorukij and Vera Visnevskaya and was TsarAlexander II of Russia's mistress and created Princess Yurievsky.
PrincessCatherine Mikhailovna Dolgorukova (In Russian Княжна Екатерина Михаиловна Долгорукова) (14 November 1847 - 15 February 1922) was the daughter of Prince Michael Dolgorukov and Vera Vishnevskaya.
Alexander and Catherine already had three children when they formed a morganatic marriage on July 6, 1880, less than a month after the death of the emperor's wife, Marie of Hesse and by Rhine, on June 8.
Catherine became a widow with the assassination of Alexander II on 1 March 1881 by members of Narodnaya Volya.
Princess Charlotte of Prussia (Frederica Louise Charlotte Wilhelmina, July 13, 1798-November 1, 1860) was, as Alexandra Feodorovna, Empress consort of Russia as the wife Nicholas I of Russia.
Alexander Nicolaievich, the future Tsarevich and then Emperor Alexander II of Russia (1818-1881), married firstly Marie of Hesse and secondly, morganatically, princessCatherineDolgoruki.
Married Maximilian de Beauharnais, Duke of Leuchtenberg (son of Eugène de Beauharnais), which marriage was accepted as equal (ebenbuertig) by her father.