Prince_Franz,_Duke_of_Hohenberg

Franz Ferdinand, Duke of Hohenberg (13 September 1927 – 16 August 1977), was the eldest son of Maximilian, Duke of Hohenberg, and Countess Elisabeth von Waldburg zu Wolfegg und Waldsee. He was also a grandson of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg. As a result of that morganatic marriage, the Hohenbergs were excluded from the line of succession to the Austro-Hungarian throne.
Following the socialist take-over in Vienna during the chaos at the close of The Great War and their exiling of the monarchy, all Austrian titles were subsequently abolished by law in 1919. From then on, names officially consisted only of forename and surname, without von or titles, scilicet Franz Ferdinand Hohenberg. Most simply ignored this Decree.