Head of State
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A Head of State is the chief public representative of a nation-state, federation or commonwealth, whose role is to personify the continuity and legitimacy of the state. In Charles de Gaulle's words, describing the role he envisaged for the French president when he wrote the modern French constitution, a head of state should embody 'The Spirit of the nation' to the nation itself and to the world.
A Head of State is traditionally a monarch or President. However, some leaders have assumed "Head of State" as their only formal title.
Chief Executive Officer:
In the vast majority of states, whether republics or monarchies, executive authority (ie, the source of governmental power) is vested in the head of state. Even in parliamentary systems where governments are directly answerable to parliament, governments may still in theory exercise powers via the head of state, producing such terms as Her Majesty's Government or His Excellency's Government. Examples are found in, among other states, Australia, Austria, Canada Denmark, France, Italy and the United Kingdom. The few exceptions include Republic of Ireland and Sweden.
In parliamentary systems, though the head of state may be the nominal chief executive officer of the state, in reality powers are usually exercised by a cabinet, presided over by a Prime Minister who is answerable to parliament. However, exceptions exist even to this; for instance, in some times of exceptional crisis during the 20th century (typically German invasions), the then King of the Belgians[?] has exercised this capacity directly; this shows that such a direct capacity had and may still have a latent existence there, and so possibly elsewhere as well.
In some semi-presidential systems[?], a president may be an active player in government, with the government answerable in practice both to the head of state and parliament. The most striking example is the current Fifth French Republic[?]. In the French case, where parliament is controlled by the party which the President belonged to, the President is usually the dominant political player in government. Where, however, the 'opposition' to the President control parliament, given that the government is answerable to parliament, the President has little choice but to share power with an 'opposition' government. When this occurs, it is called Cohabitation. In practice, the government controls the internal policy agenda, with the President limiting his role to foreign affairs, subject to the government.
As the above quote by Charles DeGaulle indicates, one of the most important roles of the modern head of state is being a symbolic national symbol[?] of the nation.
In most countries portraits of the head of state can be found in government offices, airports, libraries, and other buildings of the sort. The idea is to use these portraits to make the public aware of symbolic connection to the government, a practice that dates back to medival times. Sometimes this practice is taken to excess, and the head of state begins to believe that he is the only symbol of the nation. A personality cult thus ensues, where the image of the head of state is the only visual represenation of the country, surpassing other symbols such as the flag, constituion[?], founding fathers[?], etc.
In diplomatic affairs, heads of state are often the first person to greet an important foreign vistor. They may also assume a sort of informal "host" role during the VIP's visit, inviting the vistor to a state dinner at his or her mansion or palace, or some other equally hospitable affair.
In some states, where the the one person holds multiple headships of state, they may be represented by a Governor-General. (Examples: Canada, Australia and New Zealand), where the monarch, Queen Elizabeth II resides in another of her kingdoms, the United Kingdom and so is represented by a governor-general. Though the governor-general may fulfill many of the roles of a head of state, s/he is not a head of state themselves, but the representative of the head of state. See, for example, the Queen of Canada.
Every head of state is provided with a state residence or residences, often called a 'palace'. Among the most famous such residences are:
See also:
Loss of Supply, President, Prime Minister, Monarch, Governor-General
Table of contents
1 Roles of a Head of State
2 The Head of State and the Government
3 Symbolic role
4 Selection of Heads of State
Roles of a Head of State 
Patrice MacMahon, duc de Magenta
President of the Third French Republic (1875-1879)
controversially dissolved parliament in 1877.
In practical terms, heads of state fulfil a number of criteria;

George Washington
1st President of the United States
(1789-1797)

The Federal Council of Switzerland
The seven-member collective Head of State of Switzerland (2002-present)
The Head of State and the Government 
Emperor Napoleon III
President of the Second French Republic (1848-1852)
made himself
Emperor of France (1852-70)In Presidential systems or in absolute monarchies, a head of state is normally not merely head of state but the active chief executive officer of the government. The principle example of this is the United States.
Symbolic role
Selection of Heads of State 
Elizabeth II
multiple head of state, as
Queen of the United Kingdom,
Australia, Canada,
New Zealand and other states
(1952-present)
Heads of state may:
Governors-General
Other Information