The designation of King-Grand Duke was held by the three monarchs of the

House of Orange-Nassau The House of Orange-Nassau (Dutch: ''Huis van Oranje-Nassau'', ) is the current reigning house of the Netherlands. A branch of the European House of Nassau, the house has played a central role in the politics and government of the Netherlands ...

that ruled

Luxembourg Luxembourg ( ; lb, Lëtzebuerg ; french: link=no, Luxembourg; german: link=no, Luxemburg), officially the Grand Duchy of Luxembourg, ; french: link=no, Grand-Duché de Luxembourg ; german: link=no, Großherzogtum Luxemburg is a small lan ...

and the

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

personal union A personal union is the combination of two or more states that have the same monarch while their boundaries, laws, and interests remain distinct. A real union, by contrast, would involve the constituent states being to some extent interlink ...

, between 1815 and 1890. These monarchs thus held the titles of

King of the Netherlands King of The Netherlands (Dutch language, Dutch: ''Koning der Nederlanden'') is the title of the Dutch head of state. The king serves as the Head of state, head of state of the Kingdom of the Netherlands, which includes the constituent nations of ...

and

Grand Duke of Luxembourg The Grand Duke of Luxembourg ( lb, Groussherzog vu Lëtzebuerg, french: Grand-duc de Luxembourg, german: Großherzog von Luxemburg) is the monarchical head of state of Luxembourg. Luxembourg has been a grand duchy since 15 March 1815, when it w ...

concurrently, and, although not strictly a title in its own right, that of 'King-Grand Duke' was used in legislation and official documents in Luxembourg throughout the period. The three King-Grand Dukes were: *

William I William I; ang, WillelmI (Bates ''William the Conqueror'' p. 33– 9 September 1087), usually known as William the Conqueror and sometimes William the Bastard, was the first Norman king of England, reigning from 1066 until his death in 1087 ...

(15 March 1815 – 7 October 1840) * William II (7 October 1840 – 17 March 1849) *

William III William III or William the Third may refer to: Kings * William III of Sicily (c. 1186–c. 1198) * William III of England and Ireland or William III of Orange or William II of Scotland (1650–1702) * William III of the Netherlands and Luxembourg ...

(17 March 1849 – 23 November 1890) The titles separated in 1890. Under the

Nassau Family Pact The Nassau Family Pact was a mutual pact of inheritance and succession made in 1783 by princes of the House of Nassau. It confirmed that Salic Law was to operate in favor of all the agnatic lines of the family, specifically the two senior survivin ...

of 1783, all 'German' lands, including the Grand Duchy of Luxembourg, were to be inherited by

Salic law The Salic law ( or ; la, Lex salica), also called the was the ancient Frankish civil law code compiled around AD 500 by the first Frankish King, Clovis. The written text is in Latin and contains some of the earliest known instances of Old Du ...

, whereas all non-German lands were unaffected. Thus, when Wilhelmina inherited the Dutch crown on the death of her father, William III, she was precluded from inheriting the crown of Luxembourg. Hence, it was inherited by Adolphe, formerly Duke of Nassau, parting the titles and ending the period of the King-Grand Dukes.

See also