Olga Prinzessin zu Windisch-Grätz (1853-1934) (1853–1934) Parents Duchess Luise of Mecklenburg-Schwerin Prince Hugo, 2nd Prince of Windisch-Graetz Children Contessa Valentina Mocenigo Siblings Prince Hugo Weriand, 3rd Prince of Windisch-Graetz Princess Marie of Windisch-Graetz Alexandrine Prinzessin zu Windisch-Grätz Elisabeth Prinzessin zu Windisch-Grätz Aloisa Prinzessin zu Windisch-Grätz Ernst Prinz zu Windisch-Grätz Partners Conte Anfrea Mocenigo