Monarchy of Luxembourg

Grand Duke of Luxembourg
Groussherzog vu Lëtzebuerg
Arms of the Grand Duke of Luxembourg
Standard of the Grand Duke of Luxembourg
Incumbent Henri of Luxembourg since 7 October 2000
Style	His Royal Highness
Type	Head of state
Residence	Berg Castle, Colmar-Berg
Seat	Grand Ducal Palace, Luxembourg City
Constituting instrument	Constitution of Luxembourg
First holder	William I, King of the Netherlands, Grand Duke of Luxembourg
Succession	Guillaume, Hereditary Grand Duke of Luxembourg
Website	monarchie.lu/en

The Grand Duke of Luxembourg (Luxembourgish: Groussherzog vu Lëtzebuerg, French: Grand-duc de Luxembourg, German: Großherzog von Luxemburg) is the head of state of Luxembourg. Luxembourg has been a grand duchy since 15 March 1815, when it was created from territory of the former Duchy of Luxembourg. It was in personal union with the United Kingdom of the Netherlands until 1890 under the House of Orange-Nassau. Luxembourg is the world's only sovereign Grand Duchy and since 1815, there have been nine monarchs, including the incumbent, Henri.