A Grand Duke is a noble title that ranks above a Duke but below a King or Emperor. This title is often associated with certain regions or countries, particularly in Europe. Grand Dukes typically govern a territory or principality and may have ceremonial duties, but their political power can vary significantly depending on the country and historical context. The title of Grand Duke is most famously associated with countries like Luxembourg and Russia. In Luxembourg, the Grand Duke is the head of state, while in Russia, the title was historically used by members of the royal family. Grand Dukes often play a role in cultural and social events within their regions.