Figurehead in the context of "President of Singapore"

A head of state is the public persona of a sovereign state. The name given to the office of head of state depends on the country's form of government and any separation of powers; the powers of the office in each country range from being also the head of government to being little more than a ceremonial figurehead.

In a parliamentary system, such as India or the United Kingdom, the head of state usually has mostly ceremonial powers, with a separate head of government. However, in some parliamentary systems, like South Africa, there is an executive president that is both head of state and head of government. Likewise, in some parliamentary systems the head of state is not the head of government, but still has significant powers, for example Morocco. In contrast, a semi-presidential system, such as France, has both heads of state and government as the de facto leaders of the nation (in practice, they divide the leadership of the nation between themselves).

The Kamakura shogunate (Japanese: 鎌倉幕府, Hepburn: Kamakura bakufu) was the feudal military government of Japan during the Kamakura period from 1185 to 1333.

The Kamakura shogunate was established by Minamoto no Yoritomo after victory in the Genpei War and appointing himself as shōgun. Yoritomo governed Japan as military dictator from the eastern city of Kamakura with the emperor of Japan and his Imperial Court in the official capital city of Heian-kyō (Kyoto) as figureheads. The Kamakura shōguns were members of the Minamoto clan until 1226, the Fujiwara clan until 1252, and the last six were minor princes of the imperial family. The Hōjō clan were the de facto rulers of Japan as shikken (regent) of the shōgun from 1203. The Kamakura shogunate saw the Jōkyū War in 1221 and the Mongol invasions of Japan under Kublai Khan in 1274 and 1281. The Kamakura shogunate was overthrown in the Kenmu Restoration under Emperor Go-Daigo in 1333, re-establishing Imperial rule until Ashikaga Takauji and his offspring overthrew the imperial government and founded the Ashikaga shogunate in 1336 (Nanboku-chō period).

The government of the People's Republic of China is based on a system of people's congress within the parameters of a unitary communist state, in which the ruling Chinese Communist Party (CCP) enacts its policies through people's congresses. This system is based on the principle of unified state power, in which the legislature, the National People's Congress (NPC), is constitutionally enshrined as "the highest state organ of power." As China's political system has no separation of powers, there is only one branch of government which is represented by the legislature. The CCP through the NPC enacts unified leadership, which requires that all state organs, from the Supreme People's Court to the State Council of China, are elected by, answerable to, and have no separate powers than those granted to them by the NPC. By law, all elections at all levels must adhere to the leadership of the CCP. The CCP controls appointments in all state bodies through a two-thirds majority in the NPC. The remaining seats are held by nominally independent delegates and eight minor political parties, which are non-oppositional and support the CCP. All government bodies and state-owned enterprises have internal CCP committees that lead the decision-making in these institutions.

The NPC meets annually for about two weeks in March to review and approve major new policy directions, and in between those sessions, delegates its powers to the working legislature, the NPC Standing Committee (NPCSC). This organ adopts most national legislation, interprets the constitution and laws, and conducts constitutional reviews, and is headed by the chairman, one of China's top officials. The president is a ceremonial office and has no real power but represents China abroad, though since the 1990s, the presidency has always been held by the leader of the Chinese Communist Party. Elected separately by the NPC, the vice president has no power other than what the president bestowed on them but assists the president. The head of the State Council, the NPC's executive organ, is the premier. The General Secretary of the Chinese Communist Party is China's leading official since the CCP is tasked with formulating and setting national policy which the state, after being adopted by the NPC or relevant state organ, is responsible for implementing.

A monarch is the head of a monarchy, a form of government in which a state is ruled by an individual who normally rules for life or until abdication, and typically inherits the throne by birth. Monarchs may be autocrats (as in all absolute monarchies) or may be ceremonial figureheads, exercising only limited or no reserve powers at all, with actual authority vested in a legislature and/or executive cabinet (as in many constitutional monarchies). In many cases, a monarch will also be linked with a state religion. Most states only have a single monarch at any given time, although a regent may rule when the monarch is a minor, not present, or otherwise incapable of ruling. Cases in which two monarchs rule simultaneously over a single state, as is the current situation in Andorra, are known as coregencies.

A variety of titles are applied in English; for example, "king" and "queen", "prince" and "princess", "grand duke" and "grand duchess", "emperor" and "empress". Although they will be addressed differently in their local languages, the names and titles in the list below have been styled using the common English equivalent. Roman numerals, used to distinguish related rulers with the same name, have been applied where typical.

The president of Ireland (Irish: Uachtarán na hÉireann) is the head of state of Ireland and the supreme commander of the Irish Defence Forces. The presidency was established by the Constitution of Ireland in 1937. The first president assumed office in 1938, and became recognised internationally as head of state in 1949 after the coming into effect of the Republic of Ireland Act. The president's official residence and principal workplace is Áras an Uachtaráin in Phoenix Park, Dublin.

The presidency is a predominantly ceremonial institution, serving as the representative of the Irish state both at home and abroad. Nevertheless, the office of president is endowed with certain powers which have constitutional importance. While Éamon de Valera described his intentions for the office as being 'mainly to guard the Constitution', such a description is depricated by academic commentators, with the leading constitutional text noting "the Constitution is extremely sparing in its attribution of any independent functions to the office at all".