Grand duchy in the context of "Grand Duke of Luxembourg"

In European history, monarchy was the prevalent form of government throughout the Middle Ages, only occasionally competing with communalism, notably in the case of the maritime republics and the Swiss Confederacy.

In the early modern period (1500 - 1800 CE), Republicanism became more prevalent, but monarchy still remained predominant in Europe until the end of the 19th century. After World War I, however, most European monarchies were abolished. There remain, as of 2025, twelve sovereign monarchies in Europe. Seven are kingdoms: Denmark, Norway, Sweden, the United Kingdom, Spain, the Netherlands, and Belgium. Three are principalities: Andorra, Liechtenstein, and Monaco. Finally, Luxembourg is a grand duchy and Vatican City is a theocratic, elective monarchy ruled by the pope.

Bey, also spelled as Baig, Bayg, Beigh, Beig, Bek, Baeg, Begh, or Beg, is a Turkic title for a chieftain, and a royal, aristocratic title traditionally applied to people with special lineages to the leaders or rulers of variously sized areas in the numerous Turkic kingdoms, emirates, sultanates and empires in Central Asia, South Asia, Southeast Europe, and the Middle East, such as the Ottomans, Timurids or the various khanates and emirates in Central Asia and the Eurasian Steppe. The feminine equivalent title was begum. The regions or provinces where "beys" ruled or which they administered were called beylik, roughly meaning "governorate" or "region" (the equivalent of a county, duchy, grand duchy or principality in Europe, depending on the size and importance of the beylik). However the exact scope of power handed to the beys varied with each country, thus there was no clear-cut system, rigidly applied to all countries defining all the possible power and prestige that came along with the title.

Today, the word is still used formally as a social title for men, similar to the way the titles "sir" and "mister" are used in the English language. Additionally, it is widely used in the naming customs of Central Asia, namely in countries such as Uzbekistan, Kazakhstan and Kyrgyzstan. Notably, the ethnic designation of Uzbeks comes from the name of Öz Beg Khan of the Golden Horde, being an example of the usage of this word in personal names and even names of whole ethnic groups. The general rule is that the honorific is used with first names and not with surnames or last names.

The German Empire (German: Deutsches Reich), also referred to as Imperial Germany, the Second Reich, or simply Germany, was the period of the German Reich from the unification of Germany in 1871 until the November Revolution in 1918, when Germany changed its form of government to a republic. The German Empire consisted of 25 states, each with its own nobility: four constituent kingdoms, six grand duchies, five duchies (six before 1876), seven principalities, three free Hanseatic cities, and one imperial territory. While Prussia was only one of the four kingdoms in the realm, it contained about two-thirds of the Empire's population and territory, and Prussian dominance was also constitutionally established, since the King of Prussia was also the German Emperor (Deutscher Kaiser).

The empire was founded on 18 January 1871, when the south German states, except for Austria, Switzerland and Liechtenstein, joined the North German Confederation. The new constitution came into force on 16 April, changing the name of the federal state to the German Empire and introducing the title of German Emperor for Wilhelm I, King of Prussia from the House of Hohenzollern. Berlin remained its capital, and Otto von Bismarck, Minister President of Prussia, became chancellor, the head of government. After 1850, the states of Germany had rapidly become industrialized. In 1871, Germany had a population of 41 million people; by 1913, this had increased to 68 million. A heavily rural collection of states in 1815, the now united Germany became predominantly urban. German factories were often larger and more modern than many of their British and French counterparts, but the preindustrial sector was more backward. The success of the German Empire in the natural sciences was such that one-third of all Nobel Prizes went to German inventors and researchers. During its 47 years of existence, the German Empire became an industrial, technological, and scientific power in Europe, and by 1913, Germany was the largest economy in continental Europe and the third largest in the world. Germany also became a great power, building the longest railway network of Europe, the world's strongest army, and a fast-growing industrial base. Starting very small in 1871, in a decade, the navy became second only to Britain's Royal Navy.

A queen regnant (pl.: queens regnant) is a female monarch, equivalent in rank, title and position to a king. She reigns suo jure (in her own right) over a realm known as a kingdom; as opposed to a queen consort, who is married to a reigning king; or a queen regent, who is the guardian of a child monarch and rules pro tempore in the child's stead or instead of her husband who is absent from the realm, be it de jure in sharing power or de facto in ruling alone. A queen regnant is sometimes called a woman king. A princess, duchess, or grand duchess regnant is a female monarch who reigns suo jure over a principality or (grand) duchy; an empress regnant is a female monarch who reigns suo jure over an empire.

A queen regnant possesses all the powers, such as they may be, of the monarchy, whereas a queen consort or queen regent shares her spouse's or child's rank and titles but does not share the sovereignty of her spouse or child. The husband of a queen regnant traditionally does not share the queen regnant’s rank, title, or sovereignty and usually holds a lower princely title. However, the concept of a king consort is not unheard of in both contemporary and historical periods.

The Grand Duchy of Finland was the predecessor state of modern Finland. It existed from 1809 to 1917 as an autonomous state within the Russian Empire.

Originating in the 16th century as a titular grand duchy held by the King of Sweden, the country became autonomous after its annexation by Russia in the Finnish War of 1808–1809. The Grand Duke of Finland was the Romanov Emperor of Russia, represented by the Governor-General. Due to the governmental structure of the Russian Empire and Finnish initiative, the Grand Duchy's autonomy expanded until the end of the 19th century. The Senate of Finland, founded in 1809, became the most important governmental organ and the precursor to the modern Government of Finland, the Supreme Court of Finland, and the Supreme Administrative Court of Finland.

The Grand Duchy of Würzburg (German: Großherzogtum Würzburg) was a German grand duchy centered on Würzburg existing in the Napoleonic era.

The Grand Duchy of Oldenburg (German: Großherzogtum Oldenburg, also known as Holstein-Oldenburg) was a grand duchy within the German Confederation, North German Confederation and German Empire, that consisted of three widely separated territories: Oldenburg, Eutin and Birkenfeld. It ranked tenth among the German states, had one vote in the Bundesrat, and three members in the Reichstag. Its ruling family, the House of Oldenburg, also came to rule in Denmark, Norway, Sweden, Greece, Russia and United Kingdom.