Dyarchy
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Diarchy (from
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
, ''di-'', "double", and , ''-arkhía'', "ruled"),Occasionally misspelled ''dyarchy'', as in the ''
Encyclopaedia Britannica An encyclopedia (American English) or encyclopædia (British English) is a reference work or compendium providing summaries of knowledge either general or special to a particular field or discipline. Encyclopedias are divided into article ...
'' article on the colonial British institution
duarchy, or duumvirate (from
Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...
', "the office of the two men"). is a form of government characterized by corule, with two people ruling a polity together either lawfully or ''
de facto ''De facto'' ( ; , "in fact") describes practices that exist in reality, whether or not they are officially recognized by laws or other formal norms. It is commonly used to refer to what happens in practice, in contrast with '' de jure'' ("by l ...
'', by collusion and force. The leaders of such a system are usually known as corulers. Historically, ''diarchy'' particularly referred to the system of shared rule in
British India The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one ...
established by the Government of India Acts
1919 Events January * January 1 ** The Czechoslovak Legions occupy much of the self-proclaimed "free city" of Pressburg (now Bratislava), enforcing its incorporation into the new republic of Czechoslovakia. ** HMY ''Iolaire'' sinks off the ...
and
1935 Events January * January 7 – Italian premier Benito Mussolini and French Foreign Minister Pierre Laval conclude an agreement, in which each power agrees not to oppose the other's colonial claims. * January 12 – Amelia Earhart ...
, which devolved some powers to local councils, which had included native Indian representation under the
Indian Councils Act 1892 The Indian Councils Act 1892 was an Act of British Parliament that introduced various amendments to the composition and function of legislative councils in British India. Most notably, the act expanded the number of members in the central and ...
. 'Duumvirate' principally referred to the offices of the various
duumviri The duumviri ( Latin for "two men"), originally duoviri and also known in English as the duumvirs, were any of various joint magistrates of ancient Rome. Such pairs of magistrates were appointed at various periods of Roman history both in Rome i ...
established by the
Roman Republic The Roman Republic ( la, Res publica Romana ) was a form of government of Rome and the era of the classical Roman civilization when it was run through public representation of the Roman people. Beginning with the overthrow of the Roman Ki ...
. Both, along with less common synonyms such as biarchy and tandemocracy, are now used more generally to refer to any system of joint rule or office. A
monarchy A monarchy is a form of government in which a person, the monarch, is head of state for life or until abdication. The political legitimacy and authority of the monarch may vary from restricted and largely symbolic ( constitutional monar ...
temporarily controlled by two or more people is, however, usually distinguished as a
coregency A coregency is the situation where a monarchical position (such as prince, princess, king, queen, emperor or empress), normally held by only a single person, is held by two or more. It is to be distinguished from diarchies or duumvirates such ...
. Corule is one of the oldest forms of government. Historical examples include the Pandyan dynasty of
Tamilakam Tamiḻakam (Tamil: தமிழகம்; Malayalam: തമിഴകം), refers to the geographical region inhabited by the ancient Tamil people, covering the southernmost region of the Indian subcontinent. Tamilakam covered today's Tamil Nad ...
,
Sparta Sparta ( Doric Greek: Σπάρτα, ''Spártā''; Attic Greek: Σπάρτη, ''Spártē'') was a prominent city-state in Laconia, in ancient Greece. In antiquity, the city-state was known as Lacedaemon (, ), while the name Sparta referr ...
's joint kingship, the
Roman Republic The Roman Republic ( la, Res publica Romana ) was a form of government of Rome and the era of the classical Roman civilization when it was run through public representation of the Roman people. Beginning with the overthrow of the Roman Ki ...
's
consuls A consul is an official representative of the government of one state in the territory of another, normally acting to assist and protect the citizens of the consul's own country, as well as to facilitate trade and friendship between the people ...
,
Carthage Carthage was the capital city of Ancient Carthage, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classi ...
's
Judges A judge is an official who presides over a court. Judge or Judges may also refer to: Roles *Judge, an alternative name for an adjudicator in a competition in theatre, music, sport, etc. *Judge, an alternative name/aviator call sign for a membe ...
, and several ancient Polynesian societies. Systems of inheritance that often led to corule in Germanic and Dacian monarchies may be included as well, as may the dual occupants of the ranks of the
Inca Empire The Inca Empire (also known as the Incan Empire and the Inka Empire), called ''Tawantinsuyu'' by its subjects, ( Quechua for the "Realm of the Four Parts",  "four parts together" ) was the largest empire in pre-Columbian America. The adm ...
. Modern examples of diarchies are
Andorra , image_flag = Flag of Andorra.svg , image_coat = Coat of arms of Andorra.svg , symbol_type = Coat of arms , national_motto = la, Virtus Unita Fortior, label=none (Latin)"United virtue is stro ...
, whose princes are the
President of France The president of France, officially the president of the French Republic (french: Président de la République française), is the executive head of state of France, and the commander-in-chief of the French Armed Forces. As the presidency i ...
and the
Bishop of Urgell The Diocese of Urgell is a diocese in Catalonia (Spain) and Andorra in the historical County of Urgell,
in
Catalonia Catalonia (; ca, Catalunya ; Aranese Occitan: ''Catalonha'' ; es, Cataluña ) is an autonomous community of Spain, designated as a '' nationality'' by its Statute of Autonomy. Most of the territory (except the Val d'Aran) lies on the no ...
; and
San Marino San Marino (, ), officially the Republic of San Marino ( it, Repubblica di San Marino; ), also known as the Most Serene Republic of San Marino ( it, Serenissima Repubblica di San Marino, links=no), is the fifth-smallest country in the world an ...
, whose republic is led by two
Captains Regent The Captains Regent (Italian: ''Capitani reggenti'') are the two heads of state of the Republic of San Marino. They are elected every six months by the Grand and General Council, the country's legislative body. Normally the Regents are chose ...
.


Formal use


Current diarchies


Andorra

Andorra , image_flag = Flag of Andorra.svg , image_coat = Coat of arms of Andorra.svg , symbol_type = Coat of arms , national_motto = la, Virtus Unita Fortior, label=none (Latin)"United virtue is stro ...
is a parliamentary co-
principality A principality (or sometimes princedom) can either be a monarchical feudatory or a sovereign state, ruled or reigned over by a regnant-monarch with the title of prince and/or princess, or by a monarch with another title considered to fall un ...
. Its princes are (''
ex officio An ''ex officio'' member is a member of a body (notably a board, committee, council) who is part of it by virtue of holding another office. The term '' ex officio'' is Latin, meaning literally 'from the office', and the sense intended is 'by right ...
'') the
French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...
president President most commonly refers to: *President (corporate title) * President (education), a leader of a college or university * President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ...
and the
bishop of Urgell The Diocese of Urgell is a diocese in Catalonia (Spain) and Andorra in the historical County of Urgell,
in
Catalonia Catalonia (; ca, Catalunya ; Aranese Occitan: ''Catalonha'' ; es, Cataluña ) is an autonomous community of Spain, designated as a '' nationality'' by its Statute of Autonomy. Most of the territory (except the Val d'Aran) lies on the no ...
,
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = '' Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , ...
. Since 1962, the French president has been
elected Elected may refer to: * "Elected" (song), by Alice Cooper, 1973 * ''Elected'' (EP), by Ayreon, 2008 *The Elected, an American indie rock band See also *Election An election is a formal group decision-making process by which a population ...
by
universal suffrage Universal suffrage (also called universal franchise, general suffrage, and common suffrage of the common man) gives the right to vote to all adult citizens, regardless of wealth, income, gender, social status, race, ethnicity, or political sta ...
within
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
. The bishop of the diocese of Urgell is appointed by the
Roman Catholic Roman or Romans most often refers to: * Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD * Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a let ...
pope The pope ( la, papa, from el, πάππας, translit=pappas, 'father'), also known as supreme pontiff ( or ), Roman pontiff () or sovereign pontiff, is the bishop of Rome (or historically the patriarch of Rome), head of the worldwide Cathol ...
.


Bhutan

The 2008 Constitution affirms
Bhutan Bhutan (; dz, འབྲུག་ཡུལ་, Druk Yul ), officially the Kingdom of Bhutan,), is a landlocked country in South Asia. It is situated in the Eastern Himalayas, between China in the north and India in the south. A mountainou ...
's commitment to a traditional dual government sharing power between the
Druk Gyalpo The Druk Gyalpo (; 'Dragon King') is the head of state of the Kingdom of Bhutan. In the Dzongkha language, Bhutan is known as ''Drukyul'' which translates as "The Land of the Thunder Dragon". Thus, while kings of Bhutan are known as ''Druk ...
("King") and the Buddhist religious authorities led by the Je Khenpo. In practice, however, the religious leaders function more as advisors to the kings than as corulers.


Northern Ireland

Under the terms of the 1998
Good Friday Agreement The Good Friday Agreement (GFA), or Belfast Agreement ( ga, Comhaontú Aoine an Chéasta or ; Ulster-Scots: or ), is a pair of agreements signed on 10 April 1998 that ended most of the violence of The Troubles, a political conflict in No ...
intended to end conflict in
Northern Ireland Northern Ireland ( ga, Tuaisceart Éireann ; sco, label=Ulster Scots dialect, Ulster-Scots, Norlin Airlann) is a part of the United Kingdom, situated in the north-east of the island of Ireland, that is #Descriptions, variously described as ...
, the
First Minister A first minister is any of a variety of leaders of government cabinets. The term literally has the same meaning as "prime minister" but is typically chosen to distinguish the office-holder from a superior prime minister. Currently the title of '' ...
and deputy First Minister serve as joint heads of the area's
executive Executive ( exe., exec., execu.) may refer to: Role or title * Executive, a senior management role in an organization ** Chief executive officer (CEO), one of the highest-ranking corporate officers (executives) or administrators ** Executive di ...
. Both positions exercise identical executive powers; however they are not
heads of state A head of state (or chief of state) is the public persona who officially embodies a state Foakes, pp. 110–11 " he head of statebeing an embodiment of the State itself or representatitve of its international persona." in its unity and ...
.


San Marino

The
captains regent The Captains Regent (Italian: ''Capitani reggenti'') are the two heads of state of the Republic of San Marino. They are elected every six months by the Grand and General Council, the country's legislative body. Normally the Regents are chose ...
( it, Capitani Reggenti) of
San Marino San Marino (, ), officially the Republic of San Marino ( it, Repubblica di San Marino; ), also known as the Most Serene Republic of San Marino ( it, Serenissima Repubblica di San Marino, links=no), is the fifth-smallest country in the world an ...
are elected every six months by the Sammarinese parliament, the Grand and General Council. They serve as heads of state and government and are normally chosen from opposing parties.


Israel

After the 2019-2021 political crisis, the Basic Law of Israel's government underwent a major change. A system of two prime ministers, that can be appointed at the same time by the
Knesset The Knesset ( he, הַכְּנֶסֶת ; "gathering" or "assembly") is the unicameral legislature of Israel. As the supreme state body, the Knesset is sovereign and thus has complete control of the entirety of the Israeli government (wit ...
, was established. According to the new method, there is an “ alternate prime minister” in addition to the main and declared one. After half of the government's term, the two prime ministers change positions and status. However, during the term, the government's roles and duties are divided between the two prime ministers and each one of them is entitled to remove ministers without the other's interference.


Historical diarchies


Sparta

The office of king in
ancient Sparta Sparta (Doric Greek: Σπάρτα, ''Spártā''; Attic Greek: Σπάρτη, ''Spártē'') was a prominent city-state in Laconia, in ancient Greece. In antiquity, the city-state was known as Lacedaemon (, ), while the name Sparta referred ...
was divided between two kings from separate dynasties, each holding a
veto A veto is a legal power to unilaterally stop an official action. In the most typical case, a president or monarch vetoes a bill to stop it from becoming law. In many countries, veto powers are established in the country's constitution. Veto ...
over the other's actions. However, the Spartan kings' powers and duties consisted mainly of leading the
Spartan army The Spartan army stood at the center of the Spartan state, citizens trained in the disciplines and honor of a warrior society.Connolly (2006), p. 38 Subjected to military drills since early manhood, the Spartans became one of the most feared ...
on campaign (during which only one king would usually lead a given force) and certain religious functions, as well as having ex-officio seats in the
Gerousia The Gerousia (γερουσία) was the council of elders in ancient Sparta. Sometimes called Spartan senate in the literature, it was made up of the two Spartan kings, plus 28 men over the age of sixty, known as gerontes. The Gerousia was a pr ...
(Senate). Actual day-to-day public administration in Sparta was managed by the
ephor The ephors were a board of five magistrates in ancient Sparta. They had an extensive range of judicial, religious, legislative, and military powers, and could shape Sparta's home and foreign affairs. The word "''ephors''" (Ancient Greek ''ép ...
s.


Roman Republic

Following the
overthrow of the Roman monarchy The overthrow of the Roman monarchy was an event in ancient Rome that took place between the 6th and 5th centuries BC where a political revolution replaced the then-existing Roman monarchy under Lucius Tarquinius Superbus with a republic. ...
, the Romans established an
oligarchic Oligarchy (; ) is a conceptual form of power structure in which power rests with a small number of people. These people may or may not be distinguished by one or several characteristics, such as nobility, fame, wealth, education, or corporate, r ...
Roman Republic The Roman Republic ( la, Res publica Romana ) was a form of government of Rome and the era of the classical Roman civilization when it was run through public representation of the Roman people. Beginning with the overthrow of the Roman Ki ...
which divided
supreme executive power The Supreme Executive Power ( es, link=no, Supremo Poder Ejecutivo) was the provisional government of Mexico that governed between the fall of the First Mexican Empire in April 1823 and the election of the first Mexican president, Guadalupe Victo ...
( la, imperium) between two
consuls A consul is an official representative of the government of one state in the territory of another, normally acting to assist and protect the citizens of the consul's own country, as well as to facilitate trade and friendship between the people ...
, both elected each year and each holding a
veto A veto is a legal power to unilaterally stop an official action. In the most typical case, a president or monarch vetoes a bill to stop it from becoming law. In many countries, veto powers are established in the country's constitution. Veto ...
over the other's actions. The historical
duumviri The duumviri ( Latin for "two men"), originally duoviri and also known in English as the duumvirs, were any of various joint magistrates of ancient Rome. Such pairs of magistrates were appointed at various periods of Roman history both in Rome i ...
were not rulers but magistrates, performing various judicial, religious, or public functions.


Hungary

The
Hungarians Hungarians, also known as Magyars ( ; hu, magyarok ), are a nation and  ethnic group native to Hungary () and historical Hungarian lands who share a common culture, history, ancestry, and language. The Hungarian language belongs to the ...
originally possessed a system of dual kingship, with religious authority vested in the
kende The ''kende'' (or ''kündü'') was one of the kings of the dual-monarchy of the early Hungarians along with the '' gyula'' or war-chief. The function of the ''kende'' is believed to have been a religious one ("sacral prince").Victor SpineiThe Grea ...
and military authority vested in the war-chief ('). It is believed that when the kende
Kurszán Kurszán (died 904), was a kende of the Magyars in the dual leadership with Árpád serving as a gyula - according to a mainstream theory. While ''kende'' probably corresponded roughly to the Khazar title ''khagan'', Kurszán's role equated to the ...
was killed a little after the arrival of the Hungarians in
Pannonia Pannonia (, ) was a province of the Roman Empire bounded on the north and east by the Danube, coterminous westward with Noricum and upper Italy, and southward with Dalmatia and upper Moesia. Pannonia was located in the territory that is now west ...
, his role was usurped by the war-chief
Árpád Árpád (; 845 – 907) was the head of the confederation of the Magyar tribes at the turn of the 9th and 10th centuries. He might have been either the sacred ruler or '' kende'' of the Hungarians, or their military leader or '' g ...
, establishing the Hungarian monarchy. It is not known with certainty whether Árpád was originally the kende or the gyula.


Medieval Europe

A
paréage In Medieval France a ''paréage'' or pariage was a feudal treaty recognising joint sovereignty over a territory by two rulers, who were on an equal footing, '' pari passu''; compare peer. On a familial scale, ''paréage'' could also refer to the ...
was a
feudal Feudalism, also known as the feudal system, was the combination of the legal, economic, military, cultural and political customs that flourished in medieval Europe between the 9th and 15th centuries. Broadly defined, it was a way of structur ...
treaty recognizing the "
equal footing The equal footing doctrine, also known as equality of the states, is the principle in United States constitutional law that all states admitted to the Union under the Constitution since 1789 enter on equal footing with the 13 states already in ...
" ( la, pari passu) of two sovereigns over a territory. The most famous such arrangement was the 1278 treaty that established modern
Andorra , image_flag = Flag of Andorra.svg , image_coat = Coat of arms of Andorra.svg , symbol_type = Coat of arms , national_motto = la, Virtus Unita Fortior, label=none (Latin)"United virtue is stro ...
. Others include
Maastricht Maastricht ( , , ; li, Mestreech ; french: Maestricht ; es, Mastrique ) is a city and a municipality in the southeastern Netherlands. It is the capital and largest city of the province of Limburg. Maastricht is located on both sides of the ...
, which was shared by the
Duke of Brabant The Duke of Brabant (, ) was the ruler of the Duchy of Brabant since 1183/1184. The title was created by the Holy Roman Emperor Frederick Barbarossa in favor of Henry I of the House of Reginar, son of Godfrey III of Leuven (who was duke of Low ...
and the
Prince-Bishopric of Liège The Prince-Bishopric of Liège or Principality of Liège was an ecclesiastical principality of the Holy Roman Empire that was situated for the most part in present-day Belgium. It was an Imperial Estate, so the bishop of Liège, as its prince, ...
. After the establishment of the
Dutch Republic The United Provinces of the Netherlands, also known as the (Seven) United Provinces, officially as the Republic of the Seven United Netherlands ( Dutch: ''Republiek der Zeven Verenigde Nederlanden''), and commonly referred to in historiograph ...
, it became a
condominium A condominium (or condo for short) is an ownership structure whereby a building is divided into several units that are each separately owned, surrounded by common areas that are jointly owned. The term can be applied to the building or complex ...
of Liège and the United Provinces, which administered it through the
States General of the Netherlands The States General of the Netherlands ( nl, Staten-Generaal ) is the supreme bicameral legislature of the Netherlands consisting of the Senate () and the House of Representatives (). Both chambers meet at the Binnenhof in The Hague. The State ...
until 1794.


Japan

During
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the n ...
's
shogunate , officially , was the title of the military dictators of Japan during most of the period spanning from 1185 to 1868. Nominally appointed by the Emperor, shoguns were usually the de facto rulers of the country, though during part of the Kamakura ...
, the
emperor An emperor (from la, imperator, via fro, empereor) is a monarch, and usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife ( empress consort), mother ( ...
was notionally a supreme spiritual and temporal lord who delegated authority for joint rule to the ''
shōgun , officially , was the title of the military dictators of Japan during most of the period spanning from 1185 to 1868. Nominally appointed by the Emperor, shoguns were usually the de facto rulers of the country, though during part of the Kamaku ...
''. In practice, the ''shōguns'' power was so complete that they are usually considered ''
de facto ''De facto'' ( ; , "in fact") describes practices that exist in reality, whether or not they are officially recognized by laws or other formal norms. It is commonly used to refer to what happens in practice, in contrast with '' de jure'' ("by l ...
'' monarchs rather than
viceroy A viceroy () is an official who reigns over a polity in the name of and as the representative of the monarch of the territory. The term derives from the Latin prefix ''vice-'', meaning "in the place of" and the French word ''roy'', meaning " ...
s or corulers.


Tibet

Between 1642 and 1751, political power in
Tibet Tibet (; ''Böd''; ) is a region in East Asia, covering much of the Tibetan Plateau and spanning about . It is the traditional homeland of the Tibetan people. Also resident on the plateau are some other ethnic groups such as Monpa people, ...
was shared between the
5th Fifth is the ordinal form of the number five. Fifth or The Fifth may refer to: * Fifth Amendment to the United States Constitution, as in the expression "pleading the Fifth" * Fifth column, a political term * Fifth disease, a contagious rash tha ...
,
6th 6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number. In mathematics Six is the smallest positive integer which is neither a square number nor a prime number; it is the second ...
, and 7th Dalai Lamas who headed the realm's Buddhist
state religion A state religion (also called religious state or official religion) is a religion or creed officially endorsed by a sovereign state. A state with an official religion (also known as confessional state), while not secular, is not necessarily a t ...
and various secular rulers known as desis. The growing power of the desis caused the 7th Dalai Lama to abolish the post and replace it with a council known as the
Kashag The Kashag (; ), was the governing council of Tibet during the rule of the Qing dynasty and post-Qing period until the 1950s. It was created in 1721, and set by Qianlong Emperor in 1751 for the Ganden Phodrang in the 13-Article Ordinance for ...
, permitting him to consolidate his authority over the realm. A similar system arose in
Bhutan Bhutan (; dz, འབྲུག་ཡུལ་, Druk Yul ), officially the Kingdom of Bhutan,), is a landlocked country in South Asia. It is situated in the Eastern Himalayas, between China in the north and India in the south. A mountainou ...
, with the Wangchuck
governor A governor is an administrative leader and head of a polity or political region, ranking under the head of state and in some cases, such as governors-general, as the head of state's official representative. Depending on the type of political ...
(''penlop'') of
Trongsa Trongsa, previously Tongsa (, ), is a Thromde or town, and the capital of Trongsa District in central Bhutan. The name means "new village" in Dzongkha. The first temple was built in 1543 by the Drukpa lama Ngagi Wangchuck, who was the great-gran ...
becoming the
Druk Desi The Druk Desi (Dzongkha: འབྲུག་སྡེ་སྲིད་; Wylie:'' 'brug sde-srid''; also called " Deb Raja")The original title is Dzongkha: སྡེ་སྲིད་ཕྱག་མཛོད་; Wylie: ''sde-srid phyag-mdzod''. wa ...
and
Druk Gyalpo The Druk Gyalpo (; 'Dragon King') is the head of state of the Kingdom of Bhutan. In the Dzongkha language, Bhutan is known as ''Drukyul'' which translates as "The Land of the Thunder Dragon". Thus, while kings of Bhutan are known as ''Druk ...
in 1907. In contrast to Tibet, the dynasty eventually consolidated its power and now rules as the kings of Bhutan.


Canada

The
colonial Colonial or The Colonial may refer to: * Colonial, of, relating to, or characteristic of a colony or colony (biology) Architecture * American colonial architecture * French Colonial * Spanish Colonial architecture Automobiles * Colonial (1920 au ...
Province of Canada The Province of Canada (or the United Province of Canada or the United Canadas) was a British colony in North America from 1841 to 1867. Its formation reflected recommendations made by John Lambton, 1st Earl of Durham, in the Report on the ...
was usually governed by two joint premiers from 1841 to 1867. Usually, one was chosen from the English-speaking
Canada West The Province of Canada (or the United Province of Canada or the United Canadas) was a British colony in North America from 1841 to 1867. Its formation reflected recommendations made by John Lambton, 1st Earl of Durham, in the Report on the ...
and the other one from the French-speaking
Canada East Canada East (french: links=no, Canada-Est) was the northeastern portion of the United Province of Canada. Lord Durham's Report investigating the causes of the Upper and Lower Canada Rebellions recommended merging those two colonies. The ne ...
.


Russia

From 1619-1633, Tsar
Michael of Russia Michael I ( Russian: Михаил Фёдорович Романов, ''Mikhaíl Fyódorovich Románov'') () became the first Russian tsar of the House of Romanov after the Zemskiy Sobor of 1613 elected him to rule the Tsardom of Russia. H ...
ruled along with his father,
Patriarch Filaret of Moscow Feodor Nikitich Romanov (russian: Фео́дор Ники́тич Рома́нов, ; 1553 – 1 October 1633) was a Russian boyar who after temporary disgrace rose to become patriarch of Moscow as Filaret (russian: Филаре́т, ), and bec ...
. Both were addressed as Velikiy Gosudar (Great Sovereign), held court together, and when they did not the ceremony was the same. While both were equal in theory, in practice Patriarch Filaret ruled, with Michael supporting whatever his father ordered. Between the
February Revolution The February Revolution ( rus, Февра́льская револю́ция, r=Fevral'skaya revolyutsiya, p=fʲɪvˈralʲskəjə rʲɪvɐˈlʲutsɨjə), known in Soviet historiography as the February Bourgeois Democratic Revolution and some ...
in March 1917 and the
October Revolution The October Revolution,. officially known as the Great October Socialist Revolution. in the Soviet Union, also known as the Bolshevik Revolution, was a revolution in Russia led by the Bolshevik Party of Vladimir Lenin that was a key mom ...
in November, political power in Russia was divided between the
Russian Provisional Government The Russian Provisional Government ( rus, Временное правительство России, Vremennoye pravitel'stvo Rossii) was a provisional government of the Russian Republic, announced two days before and established immediately ...
and the
Petrograd Soviet The Petrograd Soviet of Workers' and Soldiers' Deputies (russian: Петроградский совет рабочих и солдатских депутатов, ''Petrogradskiy soviet rabochikh i soldatskikh deputatov'') was a city council of P ...
, a condition described by
Vladimir Lenin Vladimir Ilyich Ulyanov. ( 1870 – 21 January 1924), better known as Vladimir Lenin,. was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 to 1 ...
as "Dual Power". He elaborated the situation into a dual-power doctrine, whereby
Communist Communism (from Latin la, communis, lit=common, universal, label=none) is a far-left sociopolitical, philosophical, and economic ideology and current within the socialist movement whose goal is the establishment of a communist society, a s ...
s collaborated with and then supplanted existing bourgeois forms of government.


India

Named as the India Secretary for the
Lloyd George ministry Liberal David Lloyd George formed a coalition government in the United Kingdom in December 1916, and was appointed Prime Minister of the United Kingdom by King George V. It replaced the earlier wartime coalition under H. H. Asquith, which had ...
,
Edwin Samuel Montagu Edwin Samuel Montagu PC (6 February 1879 – 15 November 1924) was a British Liberal politician who served as Secretary of State for India between 1917 and 1922. Montagu was a "radical" Liberal and the third practising Jew (after Sir Herber ...
made the " Grand Declaration" on 20 August 1917 that British policy would henceforth be "increasing association of Indians in every branch of the administration and the gradual development of self-governing institutions". Montagu and Viscount Chelmsford, the
Governor-General of India The Governor-General of India (1773–1950, from 1858 to 1947 the Viceroy and Governor-General of India, commonly shortened to Viceroy of India) was the representative of the monarch of the United Kingdom and after Indian independence in 1 ...
, then made an extensive tour of the subcontinent in 1917 and 1918. The Montague–Chelmsford Report's recommendations formed the basis for the
Government of India Act 1919 The Government of India Act 1919 (9 & 10 Geo. 5 c. 101) was an Act of the Parliament of the United Kingdom. It was passed to expand participation of Indians in the government of India. The Act embodied the reforms recommended in the report of ...
that established "diarchy" in
British India The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one ...
. Under that act, the executive was to be headed by a governor appointed by the Secretary of State, who could consult the Governor General. The governor was responsible to the Secretary of State for acts of omission and commission. He was to maintain law and order in the province and ensure that the provincial administration worked smoothly. In respect of transferred subjects, he was to be assisted by his ministers whereas reserved subjects were to be administered by the Governor General and his executive council. The members of the Executive Council were to be appointed by the Secretary of State and were responsible to him in all matters. There were certain matters that he was to administer at his own discretion, in which he was responsible to the Secretary of State. Each councillor was to remain in office for a period of four years. Their salaries and service conditions were not subject to the vote of provincial legislature. All decisions in the council were to be taken by a majority of votes, the Governor being able to break ties.


Samoa

During the establishment of the modern state of
Samoa Samoa, officially the Independent State of Samoa; sm, Sāmoa, and until 1997 known as Western Samoa, is a Polynesian island country consisting of two main islands (Savai'i and Upolu); two smaller, inhabited islands (Manono Island, Manono an ...
in 1962, power was shared between the two chiefs
Malietoa Tanumafili II Malietoa Tanumafili II (4 January 1913 – 11 May 2007), addressed Susuga Malietoa Tanumafili II, was the Malietoa, the title of one of Samoa's four paramount chiefs, and the head of state, or ''O le Ao o le Malo'', a position that he held for ...
and
Tupua Tamasese Meaʻole Tupua Tamasese Mea'ole (3 June 1905 – 5 April 1963) was a Western Samoan paramount chief. He held the royal title of Tupua Tamasese from 1929 to 1963, and O le Ao o le Malo (Head of State) jointly with Malietoa Tanumafili II from 1962 unti ...
. Meaʻole died the next year, after which the country functioned as a monarchy until the death of Tanumafili and a republic thereafter.


Bolivia

Following a coup d'état in 1964, former
Vice President A vice president, also director in British English, is an officer in government or business who is below the president (chief executive officer) in rank. It can also refer to executive vice presidents, signifying that the vice president is on t ...
René Barrientos René Barrientos Ortuño (30 May 1919 – 27 April 1969) was a Bolivian military officer and politician who served as the 47th president of Bolivia twice nonconsecutively from 1964 to 1966 and from 1966 to 1969. During much of his first term, ...
rose to power as president of the military junta. The following year, faced with discontent from loyalists of General
Alfredo Ovando Candía Alfredo Ovando Candía (6 April 1918 – 24 January 1982) was the Commander of the Bolivian Air Forces and ambassador who served as the 48th president of Bolivia twice nonconsecutively, first as co-president with René Barrientos from 1965 ...
, Barrientos promulgated the co-presidency between himself and Ovando Candía. The pair ruled as dual presidents until 1966 when Barrientos resigned in order to run in that year's
general election A general election is a political voting election where generally all or most members of a given political body are chosen. These are usually held for a nation, state, or territory's primary legislative body, and are different from by-elections ( ...
.


Informal use


Bureaucracy

Shared power arrangements within a modern bureaucracy may also be known as a "diarchy" or "duumvirate". Examples include the joint authority of the Chief of the Defence Force and the Secretary of the Department of Defence over the
Australian Defence Organisation The Australian Defence Organisation (ADO), also known as simply Defence, is an Australian Government organisation that consists of both the Australian Defence Force (ADF) and the Department of Defence (DoD). The ADO's collective aims are to "de ...
.


Influential outsiders

The status of monarchs is sometimes impugned by accusations of corule when an advisor, family member, lover, or friend appears to have taken too great a hand in government.
Lü Buwei Lü Buwei (291–235 BCE) was a Chinese merchant and politician of the Qin state during the Warring States period. Originally an influential merchant from the Wei () state, Lü Buwei met and befriended King Zhuangxiang of Qin, who was then a m ...
in Chinese history and
François Leclerc du Tremblay François Leclerc du Tremblay (4 November 1577 – 17 December 1638), also known as Père Joseph, was a French Greyfriar, confidant and agent of Cardinal Richelieu. He was the original ''éminence grise''—the French term ("grey eminence" ...
in France are famous examples of " éminences grises" who controlled much of their countries' policies. In British history,
George VI George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until Death and state funeral of George VI, his death in 1952. ...
's reign was mocked as a "split-level
matriarchy Matriarchy is a social system in which women hold the primary power positions in roles of authority. In a broader sense it can also extend to moral authority, social privilege and control of property. While those definitions apply in general E ...
in pants" owing to the supposed influence of his mother, Queen Mary and his wife Queen Elizabeth.


Informally shared power

Owing to
Confucian Confucianism, also known as Ruism or Ru classicism, is a system of thought and behavior originating in ancient China. Variously described as tradition, a philosophy, a Religious Confucianism, religion, a humanistic or rationalistic religion, ...
notions of
filial piety In Confucianism, Chinese Buddhism, and Daoist ethics, filial piety (, ''xiào'') (Latin: pietas) is a virtue of respect for one's parents, elders, and ancestors. The Confucian ''Classic of Filial Piety'', thought to be written around the late W ...
, Chinese and Japanese emperors were sometimes able to 'retire' but continue to exert great influence over state policy. In
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
,
Sukarno Sukarno). (; born Koesno Sosrodihardjo, ; 6 June 1901 – 21 June 1970) was an Indonesian statesman, orator, revolutionary, and nationalist who was the first president of Indonesia, serving from 1945 to 1967. Sukarno was the leader of ...
and his vice president
Mohammad Hatta Mohammad Hatta (; 12 August 1902 – 14 March 1980) was an Indonesian statesman and nationalist who served as the country's first vice president. Known as "The Proclamator", he and a number of Indonesians, including the first president of Indone ...
were nicknamed the Duumvirate ('), with Sukarno setting government policy and rallying support and Hatta managing day-to-day administration. More recently, the great influence of
Vladimir Putin Vladimir Vladimirovich Putin; (born 7 October 1952) is a Russian politician and former intelligence officer who holds the office of president of Russia. Putin has served continuously as president or prime minister since 1999: as prime min ...
over his successor
Dmitry Medvedev Dmitry Anatolyevich Medvedev ( rus, links=no, Дмитрий Анатольевич Медведев, p=ˈdmʲitrʲɪj ɐnɐˈtolʲjɪvʲɪtɕ mʲɪdˈvʲedʲɪf; born 14 September 1965) is a Russian politician who has been serving as the dep ...
was considered a duumvirate, or tandemocracy, until Putin's resumption of the office of president established him as the greater figure.. Within electoral politics, governments, coalitions and parties may sometimes have two fairly equal leaders, as with: * The temporary First Whitlam Ministry of 5–19 December 1972, composed of Gough Whitlam and
Lance Barnard Lance Herbert Barnard AO (1 May 19196 August 1997) was an Australian politician and diplomat. He was the deputy leader of the Australian Labor Party (ALP) from 1967 to 1974 and held senior ministerial office in the Whitlam Government, most no ...
, which was nicknamed the "duumvirate". * Russel Norman and Metiria Turei as joint leaders of the
Green Party of Aotearoa New Zealand The Green Party of Aotearoa New Zealand ( mi, Rōpū Kākāriki o Aotearoa, Niu Tireni), commonly known as the Greens, is a green and left-wing political party in New Zealand. Like many green parties around the world, it has four organisational ...
.


Religious leaders

In addition to actual sharing of political power between religious and military leaders, as occurred in Tibet and Bhutan, the great
soft power In politics (and particularly in international politics), soft power is the ability to co-opt rather than coerce (contrast hard power). In other words, soft power involves shaping the preferences of others through appeal and attraction. A defin ...
of a religious leader such as the
Pope The pope ( la, papa, from el, πάππας, translit=pappas, 'father'), also known as supreme pontiff ( or ), Roman pontiff () or sovereign pontiff, is the bishop of Rome (or historically the patriarch of Rome), head of the worldwide Cathol ...
of the
Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
over a devout country can sometimes be described as a form of diarchy or corule.


Traditional leaders

The Kingdom of Eswatini is a diarchy in which the
King King is the title given to a male monarch in a variety of contexts. The female equivalent is queen, which title is also given to the consort of a king. *In the context of prehistory, antiquity and contemporary indigenous peoples, the tit ...
(
Ngwenyama iNgwenyama (also ''Ingwenyama'') is the title of the male monarch of Eswatini. In English, the title is sometimes translated as King of Eswatini. The iNgwenyama reigns together with the Ndlovukazi, a spiritual leadership position held by the i ...
) rules in conjunction with his mother, the
queen mother A queen mother is a former queen, often a queen dowager, who is the mother of the reigning monarch. The term has been used in English since the early 1560s. It arises in hereditary monarchies in Europe and is also used to describe a number of ...
(
Ndlovukati Ndlovukati (literally, "She-Elephant", pl. ''tiNdlovukati''; also spelled Indlovukazi) is the Siswati title for the female monarch of Eswatini. The title is given preferentially to the mother of the reigning king (styled the ''Ngwenyama'', "Lion o ...
) in their capacity as traditional rulers. Constitutionally, however, the King is the sole head of state, though it is often argued that the giving of authority wholesale to the royal male in this way is a neo-traditionalistic as opposed to truly traditional custom.


In fiction

* In ''
The Gondoliers ''The Gondoliers; or, The King of Barataria'' is a Savoy Opera, with music by Arthur Sullivan and libretto by W. S. Gilbert. It premiered at the Savoy Theatre on 7 December 1889 and ran for a very successful 554 performances (at that time the ...
'' by
Gilbert and Sullivan Gilbert and Sullivan was a Victorian era, Victorian-era theatrical partnership of the dramatist W. S. Gilbert (1836–1911) and the composer Arthur Sullivan (1842–1900), who jointly created fourteen comic operas between 1871 and 1896, of which ...
, the fictional land of Barataria is ruled jointly for a while by two kings, who happen to be the gondoliers themselves. *
Umbar In J. R. R. Tolkien's high fantasy ''The Lord of the Rings'', Harad is the immense land south of Gondor and Mordor. Its main port is Umbar, the base of the Corsairs of Umbar whose ships serve as the Dark Lord Sauron's fleet. Its people are the ...
, in the works of
J. R. R. Tolkien John Ronald Reuel Tolkien (, ; 3 January 1892 – 2 September 1973) was an English writer and philologist. He was the author of the high fantasy works ''The Hobbit'' and ''The Lord of the Rings''. From 1925 to 1945, Tolkien was the Rawlins ...
, was ruled by a duumvirate. In its earliest years,
Gondor Gondor is a fictional kingdom in J. R. R. Tolkien's writings, described as the greatest realm of Man (Middle-earth), Men in the west of Middle-earth at the end of the Third Age. The third volume of ''The Lord of the Rings'', ''The Return of the ...
was also ruled jointly by two kings, the two sons of Elendil. He himself was king of its sister realm Arnor, and served as high king over both realms. * The Omaticaya, the
Na'vi The Pandoran biosphere is a fictional habitat introduced in James Cameron's 2009 science fiction film ''Avatar''. The ecology of the lush moon Pandora, which teems with a biodiversity of bioluminescent species ranging from hexapodal animals to ot ...
clan at the center of the film ''
Avatar Avatar (, ; ), is a concept within Hinduism that in Sanskrit literally means "descent". It signifies the material appearance or incarnation of a powerful deity, goddess or spirit on Earth. The relative verb to "alight, to make one's appearanc ...
'', are traditionally led by a pair of married
tribal chief A tribal chief or chieftain is the leader of a tribal society or chiefdom. Tribe The concept of tribe is a broadly applied concept, based on tribal concepts of societies of western Afroeurasia. Tribal societies are sometimes categorized as ...
s. One of them, the husband, oversees political and military matters while the other one, the wife, is in charge of spiritual and otherwise ceremonial affairs. * The orbital colony New New York, in the ''Worlds'' trilogy by
Joe Haldeman Joe William Haldeman (born June 9, 1943) is an American science fiction author. He is best known for his novel ''The Forever War'' (1974). That novel and other works, including ''The Hemingway Hoax'' (1991) and '' Forever Peace'' (1997), have wo ...
, is jointly governed by an elected Policy Coordinator and Engineering Coordinator. * The Federated Commonwealths of America, in ''
A Different Flesh ''A Different Flesh'' is a collection of alternate history short stories by American writer Harry Turtledove. The stories are set in a world in which ''Homo erectus'' and various megafauna survived in the Americas instead of Native Americans or ...
'' by
Harry Turtledove Harry Norman Turtledove (born June 14, 1949) is an American author who is best known for his work in the genres of alternate history, historical fiction, fantasy, science fiction, and mystery fiction. He is a student of history and completed ...
, is modelled heavily on the
Roman Republic The Roman Republic ( la, Res publica Romana ) was a form of government of Rome and the era of the classical Roman civilization when it was run through public representation of the Roman people. Beginning with the overthrow of the Roman Ki ...
, governed by two chief executives styled as Censors (although the offices are more akin to the position of
Consul Consul (abbrev. ''cos.''; Latin plural ''consules'') was the title of one of the two chief magistrates of the Roman Republic, and subsequently also an important title under the Roman Empire. The title was used in other European city-states throug ...
). With each one being able to veto the actions of the other, the election of two politically-opposed Censors was intended as a check on executive power. Censors serve a single non-renewable five-year term and (alongside commonwealth governors) become life-long-serving members of the Senate upon leaving office. * In ''
Avenue 5 ''Avenue 5'' is a science fiction comedy television series created by Armando Iannucci that premiered on HBO in the United States on January 19, 2020. It stars Hugh Laurie and Josh Gad in lead roles as captain and owner of a fictional interpl ...
'', it is suggested that the Office of
President of the United States The president of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United Stat ...
became a duumvirate comprising a human and an artificial intelligence (reminiscent of a
virtual assistant An intelligent virtual assistant (IVA) or intelligent personal assistant (IPA) is a software agent that can perform tasks or services for an individual based on commands or questions. The term "chatbot" is sometimes used to refer to virtual ...
).


See also

*
Directorial system A directorial republic is a country ruled by a college of several people who jointly exercise the powers of a head of state A head of state (or chief of state) is the public persona who officially embodies a state Foakes, pp. 110 ...
*
Monarchy A monarchy is a form of government in which a person, the monarch, is head of state for life or until abdication. The political legitimacy and authority of the monarch may vary from restricted and largely symbolic (constitutional monarchy) ...
, rule by a single person *
Coregency A coregency is the situation where a monarchical position (such as prince, princess, king, queen, emperor or empress), normally held by only a single person, is held by two or more. It is to be distinguished from diarchies or duumvirates such ...
, temporary rule over a monarchy by two or more people *
Triumvirate A triumvirate ( la, triumvirātus) or a triarchy is a political institution ruled or dominated by three individuals, known as triumvirs ( la, triumviri). The arrangement can be formal or informal. Though the three leaders in a triumvirate are ...
, joint rule by three people *
Tetrarchy The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the '' augusti'', and their juniors colleagues and designated successors, the '' caesares' ...
, joint rule by four people *
Decemviri The decemviri or decemvirs (Latin for "ten men") were some of the several 10-man commissions established by the Roman Republic. The most important were those of the two Decemvirates, formally the " decemvirate with consular power for writing ...
, joint rule by ten people *
Condominium (international law) A condominium (plural either condominia, as in Latin, or condominiums) in international law is a political territory (state or border area) in or over which multiple sovereign powers formally agree to share equal ''dominium'' (in the sense of ...


Notes


References


Citations


Sources

* . * . * . {{refend Collective heads of state Greek words and phrases