In February 1847, Liszt played in Kiev. There he met the Princess Carolyne zu Sayn-Wittgenstein, who was to become one of the most significant people in the rest of his life. She persuaded him to concentrate on composition, which meant giving up his career as a travelling virtuoso. After a tour of the Balkans, Turkey and Russia that summer, Liszt gave his final concert for pay at Elisavetgrad in September. He spent the winter with the princess at her estate in Woronince.
Princess Carolyne lived with Liszt during his years in Weimar. She eventually wished to marry Liszt, but since she had been previously married and her husband, Russian military officer Prince Nikolaus zu Sayn-Wittgenstein-Ludwigsburg (1812–1864), was still alive, she had to convince the Roman Catholic authorities that her marriage to him had been invalid. After huge efforts and a monstrously intricate process, she was temporarily successful (September 1860). It was planned that the couple would marry in Rome, on October 22, 1861, Liszt's 50th birthday. Liszt having arrived in Rome on October 21, 1861, the Princess nevertheless declined, by the late evening, to marry him. It appears that both her husband and the Tsar of Russia had managed to quash permission for the marriage at the Vatican. The Russian government also impounded her several estates in the Polish Ukraine, which made her later marriage to anybody unfeasible.
Subsequently, her relationship to Liszt became one of platonic companionship, especially after he had received minor orders in the Catholic Church and become an abbé. She was devastated by Liszt's death and survived him only a very few months. She died in Rome on March 9, 1887.