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A prime minister may be either:
In parliamentary systems like the Westminster system, the prime minister is the head of the government while the position of head of state is largely ceremonial. In some monarchies the prime minister exercises powers (known as the Royal Prerogative) which are constitutionally vested in the Crown and can be exercised without the approval of parliament. As well as being Head of Government, a prime minister may have other roles or titles—the Prime Minister of the United Kingdom, for example, is also First Lord of the Treasury. Prime ministers may take other ministerial posts—for example during the Second World War Winston Churchill was also Minister of Defence.
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The term Prime Minister originated in the 18th century in the United Kingdom. Since mediaeval times Kings of England and the United Kingdom had ministers in whom they placed special trust and who were regarded as the head of the government. Examples were Thomas Cromwell under Henry VIII, Robert Cecil under Elizabeth I, Clarendon under Charles II and Godolphin under Queen Anne. These ministers held a variety of formal posts, but were commonly known as "the Minister," the "first Minister" or the "prime Minister."
The power of these ministers depended entirely on the personal favour of the Monarch. Although managing the Parliament was one of the necessary skills of holding high office, they did not depend on a parliamentary majority for their power. Although there was a Cabinet, it was appointed entirely by the Monarch, and the Monarch usually presided over its meetings. When the Monarch tired of a first minister, they could be dismissed, or worse: Cromwell was executed and Clarendon driven into exile when they lost favour. Kings sometimes divided power equally between two or more ministers to prevent any one minister becoming too powerful. Late in Anne's reign, for example, the Tory ministers Harley and St John shared power.
The turning point in the evolution of the prime ministership came with the death of Anne in 1714 and the accession of George I. George spoke no English, spent much of his time at his home in Hannover, and had neither knowledge of nor interest the details of British government. In these circumstances it was inevitable that the King's first minister would become the de facto head of the government. From 1721 this was the Whig politician Robert Walpole, who held office for twenty-one years. Walpole chaired Cabinet meetings, appointed all the other ministers, dispensed the royal patronage and packed the House of Commons with his supporters. Under Walpole, the doctrine of Cabinet solidarity developed. Walpole required that when the Cabinet had agreed on a policy, all ministers must defend it in public or resign, and that no minister would have private dealings with the King.
Walpole, however, always denied that he was a "Prime Minister," and throughout the 18th century parliamentarians and legal scholars continued to deny that any such position was known to the Constitution. The post did not formally exist until 1905, and until then prime ministers held office by virtue of the formal post of First Lord of the Treasury. George II and George III made strenuous efforts to reclaim the personal power of the Monarch, but the increasing complexity and expense of government meant that a minister who could command the loyalty of the Commons was increasingly necessary. The long tenure of the wartime Prime Minister Pitt the Younger (1783-1801), combined with the mental illness of George III, consolidated the power of the post. By the reign of Queen Victoria it was undisputed that the Prime Minister was real ruler of the country, although his power was always conditional on the support of a majority in the Commons.
The prestige of British institutions in the 19th century and the growth of the British Empire saw the British model of Cabinet government, headed by a Prime Minister, widely copied, both in other European countries and in British colonial territories as they developed self-government. In some places alternative titles such as "Premier," "Chief Minister," "First Minister of State", "President of the Council" or "Chancellor" were adopted, but the essentials of the office were the same. By the late 20th century the majority of the world's countries had a Prime Minister or equivalent minister, holding office under either a constitutional monarchy or a ceremonial president. The main exceptions to this system have been the United States and the presidential republics in Latin America, modelled on the U.S. system, in which the President directly exercises executive authority.
The post of prime minister is one which may be encountered both in constitutional monarchies (such as Belgium, Denmark, Japan, the Netherlands, Norway, Spain, and the United Kingdom), and in republics in which the head of state is an elected (such as France) or unelected official (such as Germany) with varying degrees of real power. This contrasts with the presidential system, in which the President (or equivalent) is both the head of state and the head of the government. See also "First Minister" , "Premier", "Chief Minister" "Chancellor" and "Taoiseach": alternative titles usually equivalent in meaning to "prime minister."
In some presidential or semi-presidential systems such as those of France, Russia, South Korea, or Taiwan the prime minister is an official generally appointed by the President but approved by the legislature and responsible for carrying out the directives of the President and managing the civil service. In these systems, it is possible for the president and the prime minister to be from different political parties if the legislature is controlled by a party different from that of the president. When it arises, such a state of affairs is usually referred to as (political) cohabitation.
In parliamentary systems a prime minister can enter into office by a number of means.
Though most prime ministers are 'appointed', they are often inaccurately described as 'elected'.
The position, power and status of prime ministers differ depending on the age of the constitution in individuals.
Britain's constitution, being uncodified and largely unwritten, makes no mention of a prime minister. Though it had de facto existed for centuries, its first mention in official state documents did not occur until the first decade of the twentieth century.
Australia's Constitution makes no mention of a prime minister of Australia. The office has a de facto existence at the head of the Executive Council.
Ireland's constitution, Bunreacht na hÉireann (1937) provided for the office of taoiseach in detail, listing powers, functions and duties.
Germany's Basic Law (1949) lists the powers, functions and duties of the federal Chancellor.
Contrary to popular and journalistic myth, most prime ministers in parliamentary systems are not appointed for a specific term of office and in effect may remain in power through a number of elections and parliaments. For example, Margaret Thatcher was only ever appointed prime minister on one occasion, in 1979. She remained continuously in power until 1990, though she used the assembly of each House of Commons after a general election to reshuffle her cabinet. Some states, however, do have a term of office of the prime minister linked to the period in office on the parliament. Hence the Irish Taoiseach is formally 'renominated' after every general election. (Some constitutional experts have questioned whether this process is actually in keeping with the provisions of the Irish constitution, which appear to suggest a taoiseach should remain in office, without the requirement of a renomination, unless s/he has clearly lost the general election.) The position of prime minister is normally chosen from the political party that commands majority of seats in the lower house of parliament.
In parliamentary systems, governments are generally required to have the confidence of the lower house of parliament (though a small minority of parliaments, by giving a right to block Supply to upper houses, in effect make the cabinet responsible to both houses, though in reality upper houses, even when they have the power, rarely exercise it). Where they lose a vote of confidence, have a motion of no confidence passed against them, or where they lose Supply, most constitutional systems require either:
a) a letter of resignation or
b) a request of a parliamentary dissolution.
The latter in effect allows the government to appeal the opposition of parliament to the electorate. However in many jurisdictions a head of state may refuse a parliamentary dissolution, requiring the resignation of the prime minister and his or her government. In most modern parliamentary systems, the prime minister is the person who decides when to request a parliamentary dissolution. Older constitutions often vest this power in the cabinet. (In Britain, for example, the tradition whereby it is the prime minister who requests a dissolution of parliament dates back to 1918. Prior to then, it was the entire government that made the request. Similarly, though the modern 1937 Irish constitution grants to the Taoiseach the right to make the request, the earlier 1922 Irish Free State Constitution vested the power in the Executive Council (the then name for the Irish cabinet).
A number of different terms are used to describe prime ministers. The German prime minister is actually titled Federal Chancellor while the Irish prime minister is called the Taoiseach. In many cases, though commonly used, "prime minister" is not the official title of the office-holder; the Spanish prime minister is the President of the Government (Presidente del Gobierno). Other common forms include President of the Council of Ministers (for example in Italy, Presidente del Consiglio dei Ministri), President of the Executive Council, or Minister-President. In federations, the head of government of a state or province is most commonly known as the Premier or Chief Minister.
The title prime minister is a job title that does not form part of the prime minister's name. It is therefore poor style to refer to “Prime Minister Blair”, just as it would be strange to call someone “Bus Driver Edwards”. The correct form is "Prime Minister Tony Blair" or "Tony Blair, Prime Minister". This mistake is particularly common in the United States, where a high office title is often adopted as if it were a military rank.
The title of prime minister is lost when the officer holder ceases to be prime minister. This is not the case for some comparable positions in the United States, which can cause some confusion. When former Prime Minister of New Zealand Jim Bolger became the Ambassador to the United States, he was referred to as “Prime Minister Bolger”, which was both poor style and factually incorrect.
Commonwealth Realm prime ministers are often Privy Counsellors entitled to the style the right honourable. In the New Zealand Parliament's debating chamber the Prime Minister is referred to as the Right Honourable the Prime Minister, rather than by name.
In non-Commonwealth countries the prime minister may be entitled to the style of Excellency like a President.
The following table groups the list of past and present prime ministers and details information available in those lists.
| Heads of government offices | |
|---|---|
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Chancellor | Chief Minister | First Minister | Minister-President | Premier | President of the Executive Council | |