Princess Olga Alexandrovna Yurievskaya was the natural daughter of Alexander II of Russia by his mistress, Princess Catherine Dolgorukova. In 1880, she was legitimated by her parents' morganatic marriage.
Alexander II and Princess Catherine Dolgorukova with their children George and Olga
Clotilde, Countess von Merenberg is a German psychiatrist and the last patrilineal descendant of the House of Nassau. She is a descendant of Emperor Alexander II of Russia and of the Russian poet Alexander Pushkin.
