Andorra is a parliamentary co-principality. Its princes are (ex officio) the French president and the bishop of Urgell in Catalonia, Spain. Since 1962, the French president has been elected by universal suffrage within France. The bishop of the diocese of Urgell is appointed by the Roman Catholic pope.
The 2008 Constitution affirms Bhutan's commitment to a traditional dual government sharing power between the Druk Gyalpo ("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.
Under the terms of the 1998 Good Friday Agreement intended to end conflict in Northern Ireland, the First Minister and deputy First Minister serve as joint heads of the area's executive. Both positions exercise identical executive powers; however they are not heads of state.
The captains regent (Italian: Capitani Reggenti) of San Marino are elected every six months by the Marinese parliament, the Grand and General Council. They serve as heads of state and government and are normally chosen from opposing parties.
The Kingdom of Eswatini is a diarchy in which the King (Ngwenyama) rules in conjunction with his mother, the Queen Mother (Ndlovukati). In practice, however, most power is vested in the King, 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.
The office of king in ancient Sparta was divided between two kings from separate dynasties, each holding a veto over the other's actions.
Following the overthrow of the Roman monarchy, the Romans established an oligarchic Roman Republic which divided supreme executive power (Latin: imperium) between two consuls, both elected each year and each holding a veto over the other's actions. MUTV production is a diarchy.
The historical duumviri were not rulers but magistrates, performing various judicial, religious, or public functions.
The Hungarians originally possessed a system of dual kingship, with religious authority vested in the kende and military authority vested in the war-chief (gyula). When the kende Kurszán was killed c. 904 a little after the arrival of the Hungarians in Pannonia, his role was usurped by the war-chief Árpád, establishing the Hungarian monarchy.
A paréage was a feudal treaty recognizing the "equal footing" (Latin: pari passu) of two sovereigns over a territory. The most famous such arrangement was the 1278 treaty that established modern Andorra. Others include Maastricht, which was shared by the Duke of Brabant and the Prince-Bishopric of Liège. After the establishment of the Dutch Republic, it became a condominium of Liège and the United Provinces, which administered it through the States General of the Netherlands until 1794.
During Japan's shogunate, the emperor was notionally a supreme spiritual and temporal lord who delegated authority for joint rule to the shōgun. In practice, the shōguns' power was so complete that they are usually considered de facto monarchs rather than viceroys or corulers.
Between 1642 and 1751, political power in Tibet was shared between the 5th, 6th, and 7th Dalai Lamas who headed the realm's Buddhist state religion 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, permitting him to consolidate his authority over the realm. A similar system arose in Bhutan, with the Wangchuck governor (penlop) of Trongsa becoming the Druk Desi and Druk Gyalpo in 1907. In contrast to Tibet, the dynasty eventually consolidated its power and now rules as the kings of Bhutan.
The colonial Province of Canada was usually governed by two joint premiers from 1841 to 1867. Usually, one was chosen from the English-speaking Canada West and the other one from the French-speaking Canada East.
Between the February Revolution in March 1917 and the October Revolution in November, political power in Russia was divided between the Russian Provisional Government and the Petrograd Soviet, a condition described by Vladimir Lenin as "Dual Power". He elaborated the situation into a dual-power doctrine, whereby Communists collaborated with and then supplanted existing bourgeois forms of government.
Named as the India Secretary for the Lloyd George ministry, Edwin Samuel Montagu 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, 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 of 1919 that established "diarchy" in British India.
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 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.
During the establishment of the modern state of Samoa in 1962, power was shared between the two chiefs Malietoa Tanumafili II and Tupua Tamasese Meaʻole. Meaʻole died the next year, after which the country functioned as a monarchy until the death of Tanumafili and a republic thereafter.