Locke argued that political power is legitimate only when it is based on the consent of the governed, as expressed through a social contract between the ruler and the people.

The divine right of kings is a political and religious doctrine that asserts that a monarch's political power is derived from God and is therefore absolute and not subject to challenge by any earthly authority.

According to the social contract theory, the primary obligation of the government is to protect the natural rights of its citizens, such as the right to life, liberty, and property.

Critics of the legitimacy of political power based on tradition argue that tradition is often arbitrary and irrational, can be used to justify oppressive and unjust regimes, and is not a reliable guide for decision-making in a changing world.

Charismatic legitimacy is a type of political legitimacy based on the belief that the ruler has exceptional personal qualities, such as charisma, heroism, or prophetic abilities.

Political realism is a school of thought that emphasizes the importance of power and national interest in international relations. It is primarily concerned with the effectiveness of political institutions in achieving their goals, rather than with their moral justification or legitimacy.

Arendt argued that the essence of political power lies in the ability of people to act collectively and achieve common goals through deliberation and consensus-building.

A legitimation crisis refers to a situation where the legitimacy of a political regime is widely questioned and challenged, often leading to political instability and turmoil. It can be caused by a lack of legitimate authority, a crisis of confidence in the government's ability to solve problems, or a combination of factors.

The consent theory of political legitimacy emphasizes the importance of the consent of the governed as the basis for legitimate political authority. It argues that political power is legitimate only when it is based on the consent of those who are subject to it.

Marxist theory argues that the capitalist state is legitimate primarily through the force and coercion of the ruling class. It maintains that the state is a tool used by the ruling class to maintain its power and control over the working class.

The procedural theory of political legitimacy argues that political power is legitimate if it is exercised in accordance with established procedures and rules, regardless of the specific content of those procedures or rules.

The output legitimacy approach to political legitimacy focuses on the effectiveness of political institutions in achieving their goals. It argues that political power is legitimate if it is used to produce desirable outcomes for the citizens.

Hegemonic stability theory argues that a stable and peaceful international order is most likely to exist when there is a single dominant power, or hegemon, in the global system.

The democratic legitimacy approach to political legitimacy emphasizes the importance of the consent of the governed through democratic processes as the basis for legitimate political authority.

The natural rights theory of political legitimacy argues that political power is legitimate only if it respects the natural rights of individuals, such as the right to life, liberty, and property.