Political philosophy or political theory is the philosophical study of government, addressing questions about the nature, scope, and legitimacy of public agents and institutions and the relationships between them. Its topics include politics, justice, liberty, property, rights, law, and the enforcement of laws by authority: what they are, if they are needed, what makes a government legitimate, what rights and freedoms it should protect, what form it should take, what the law is, and what duties citizens owe to a legitimate government, if any, and when it may be legitimately overthrown, if ever.
Plato (left) and Aristotle (right), from a detail of The School of Athens, a fresco by Raphael. Plato's Republic and Aristotle's Politics secured the two Greek philosophers as two of the most influential political philosophers.
Portrait of Confucius, c. 1770
Augustine of Hippo
Thomas Aquinas
Philosophy is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions.
The statue The Thinker by Auguste Rodin is a symbol of philosophical thought.
Physics was originally part of philosophy, like Isaac Newton's observation of how gravity affects falling apples.
Aristotle was a major figure in ancient philosophy and developed a comprehensive system of thought including metaphysics, logic, ethics, politics, and natural science.
Portrait of Avicenna on a silver vase. He was one of the most influential philosophers of the Islamic Golden Age.