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| Leonilla Baryatinskaya | |||||
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| Princess of Sayn-Wittgenstein-Sayn | |||||
 Portrait by Franz Xaver Winterhalter, 1849 | |||||
| Born | 9 May 1816 Moscow, Russian Empire | ||||
| Died | 1 February 1918 (aged 101) Lausanne, Switzerland | ||||
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| Father | Prince Ivan Baryatinsky | ||||
| Mother | Countess Marie Wilhelmine von Keller | ||||
Leonilla Ivanovna Baryatinskaya, Princess of Sayn-Wittgenstein-Sayn (Russian: Леонилла Ивановна Барятинская; 9 May 1816 – 1 February 1918), was a Russian aristocrat who married Ludwig, Prince of Sayn-Wittgenstein-Sayn. She was the subject of a number of portraits by Franz Xaver Winterhalter.