House of Lorraine
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The House of Lorraine, was a family that originated from the Duchy of Lorraine in modern day France. The family later ruled the small duchy of Lorraine itself and later ruled the Grand Duchy of Tuscany, The Empress Maria Theresa was married to a Duke of Lorraine thus uniting the house of Lorraine with the far more powerful House of Habsburg.
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.