Archduke_Joseph_August_of_Austria--Emperor_of_Austria_Charles_I

Archduke Joseph August Viktor Klemens Maria of Austria, Prince of Hungary and Bohemia (9 August 1872 – 6 July 1962) was a Feldmarschall (field marshal) of the Austro-Hungarian Army and for a short period head of state of Hungary. He was a member of the House of Habsburg-Lorraine, the eldest son of Archduke Joseph Karl of Austria (1833–1905) and his wife Princess Clotilde of Saxe-Coburg and Gotha (1846–1927). Joseph August's grandfather had been Palatine Joseph of Hungary (1776–1847), Palatine and Viceroy of Hungary, a younger son of Leopold II, Holy Roman Emperor.
The Archduke Joseph Diamond, a 76.02 carat colourless diamond with internal flawless clarity, is named after the Archduke and officially recorded as his property.