Luxembourg is headed by a Grand Duke, Henri, who has ruled since 2000.
Henri ( Henri Albert Gabriel Félix Marie Guillaume born 16 April 1955 ) is the current Grand Duke of Luxembourg , reigning since 7 October 2000 . Luxembourg . As a representative democracy with a constitutional monarch , it is headed by a Grand Duke , Henri , Grand Duke of Luxembourg , and is the world 's only remaining grand duchy . In 1308 , Henry VII , Count of Luxembourg became King of the Germans and Holy Roman Emperor .