The House of Lorraine, the main and now only remaining line known as Habsburg-Lorraine, was one of the most important and longest-reigning royal houses in the history of Europe. Its senior agnates are the Dukes of Hohenberg, although the house is currently headed by Karl Habsburg-Lothringen, the titular Emperor of Austria, King of Hungary, Bohemia, Galicia and Lodomeria, Croatia, Illyria, as well as the titular King of Jerusalem.