Sophie, Duchess of Hohenberg
He was raised to Princely rank by Emperor Franz Joseph I of Austria on 19 July 1911. As he had only one daughter, upon his death in 1916 the Princely title was inherited by his brother, Prince Jaroslav von Thun und Hohenstein (1864–1929), uncle and legal guardian of the Hohenbergs, children of murdered Archduke Franz Ferdinand of Austria and Sophie, Duchess of Hohenberg, who was sister of Jaroslav's wife Countess Maria Pia Chotek von Wognin.