Dorothea von Salviati's father-in-law was born on what date?
Dorothea von Salviati Dorothea von Salviati (1907–1972), was the wife of Prince Wilhelm of Prussia, the eldest son of Crown Prince Wilhelm, the eldest son and heir of the last German Emperor, Wilhelm II.
Archduchess Maria Immakulata of Austria Archduchess Maria Immakulata of Austria (German: "Maria Immakulata Rainera Josepha Ferdinande Theresia Leopoldine Antoinette Henriette Franziska Karoline Aloysia Januaria Christine Philomena Rosalia, Erzherzogin von Österreich, Prinzessin von Toskana" ) (3 September 1878, Baden bei Wien, Lower Austria, Austria–Hungary – 25 November 1968, Schloss Altshausen, Altshausen, Baden-Württemberg, Germany) was a member of the House of Habsburg-Tuscany and Archduchess of Austria, Princess of Tuscany by birth. Maria Immakulata was the seventh child and fifth eldest daughter of Archduke Karl Salvator of Austria and his wife Princess Maria Immaculata of Bourbon-Two Sicilies.