Head of state
Multiple or collective heads of state

Sometimes multiple individuals are co-equal heads of state, or a corporate person embodies the functions of head of state. In some cases precedence rotates among the members of the collective as the term of office progresses. Of multiple royal systems, a diarchy, in which two rulers is the constitutional norm, may be distinguished from a coregency, in which a monarchy experiences an exceptional period of multiple rulers. Examples of collective republican systems include nominal triumvirates; the French Directory of the 1790s; the seven-member Swiss Federal Council, where each member acts in turn as President for one year; the Presidency of Bosnia and Herzegovina with members from three nations; the two Captains Regent of San Marino, which maintains the tradition of Italian medieval republics that had always had an even number of consuls.

In the Roman Republic there were two heads of state, styled consul, both of whom alternated months of authority during their year in office, similarly there was an even number of supreme magistrates in the Italic republics of Ancient Age. In the Athenian Republic there were nine supreme magistrates, styled archons. In Carthage there were two supreme magistrates, styled kings or suffetes (judges). In ancient Sparta there were two hereditary kings, belonging to two dynasties.

In the Soviet Union, the Presidium of the Supreme Soviet (between 1938 and 1989) served as the collective head of state. After World War II the Soviet model was subsequently adopted by almost all countries belonged to its sphere of influence. Czechoslovakia remained the only country among them that retained an office of president as a form of a single head of state throughout this period; Poland and Hungary, which initially had western-style constitutions (and therefore, western-style presidencies), switched to the presidium model with the adoption of new Soviet-influenced constitutions; Romania, which was a monarchy before the Soviet takeover, was the only country to move to a unitary presidency from a collective head of state, a move done by dictator Nicolae Ceausescu in 1974.

A modern example of a collective head of state is the Sovereignty Council of Sudan, the interim ruling council of Sudan. The Sovereignty Council comprises 11 ministers, who together have exercised all governmental functions for Sudan since the fall of President Omar Al-Bashir. Decisions are made either by consensus or by a super majority vote (8 members).

The National Government of the Republic of China, established in 1928, had a panel of about 40 people as collective head of state. Though beginning that year, a provisional constitution made the Kuomintang the sole government party and the National Government bound to the instructions of the Central Executive Committee of that party.
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