House of Lorraine
The House of Lorraine, the main and now only remaining line known as Habsburg-Lorraine, is one of the most important and was one of the longest-reigning royal houses in the history of Europe. Currently the house is 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.