Countess Ekaterina Petrovna Schouvaloff 9 Jan 1801 Riga - 21 Sep 1858 Potsdam (1801–1858) Parents Sofiya Shcherbatova Pyotr Shuvalov Children Gräfin Anastasia von Schlieffen Siblings Grigory Shuvalov Andrey Shuvalov Partners Karl von Schlieffen