Timeline

(604 BC–500 BC) Laozi was a legendary Chinese philosopher considered to be the author of the Tao Te Ching, one of the foundational texts of Taoism. Modern scholarship generally regards his biographical details as later inventions and his opus a collaboration of various writers, with the name Laozi, literally meaning 'Old Master', likely intended to portray an archaic anonymity that could converse with Confucianism. Traditional accounts addend him as Li Er, born in the 6th-century BC state of Chu during China's Spring and Autumn period. Serving as the royal archivist for the Zhou court at Wangcheng, he met and impressed Confucius on one occasion, composing the Dào Dé Jīng in a single session before retiring into the western wilderness.

(552 BC–479 BC) Confucius, born Kong Qiu, was a Chinese philosopher of the Spring and Autumn period who is traditionally considered the paragon of Chinese sages. Much of the shared cultural heritage of the Sinosphere originates in the philosophy and teachings of Confucius. His philosophical teachings, called Confucianism, emphasized personal and governmental morality, harmonious social relationships, righteousness, kindness, sincerity, and a ruler's responsibilities to lead by virtue.

(427 BC–347 BC) Plato was an ancient Greek philosopher of Classical Athens who is most commonly considered the foundational thinker of the Western philosophical tradition. An innovator of the literary dialogue and dialectic forms, Plato influenced all the major areas of theoretical philosophy and practical philosophy, and was the founder of the Academy, a philosophical school in Athens where Plato taught the collection of philosophical theories that would later become known as Platonism.

Socrates was an ancient Greek philosopher from Classical Athens, perhaps the first Western moral philosopher, and a major inspiration on his student Plato, who largely founded the tradition of Western philosophy. An enigmatic figure, Socrates authored no texts and is known mainly through the posthumous accounts of classical writers, particularly his students Plato and Xenophon. These accounts are written as dialogues, in which Socrates and his interlocutors examine a subject in the style of question and answer; they gave rise to the Socratic dialogue literary genre. Contradictory accounts of Socrates make a reconstruction of his philosophy nearly impossible, a situation known as the Socratic problem. Socrates was a polarizing figure in Athenian society. In 399 BC, he was accused of impiety and corrupting the youth. After a trial that lasted a day, he was sentenced to death. As related by Plato, he was put to death by administration of poison after refusing offers from allies to help him escape.

(384 BC–322 BC) Aristotle was an ancient Greek philosopher and polymath. His writings span the natural sciences, philosophy, linguistics, economics, politics, psychology, and the arts. As the founder of the Peripatetic school of philosophy in the Lyceum in Athens, he began the wider Aristotelian tradition that followed, which set the groundwork for the development of modern science.

(342 BC–270 BC) Epicurus was an ancient Greek philosopher who founded the philosophical school of Epicureanism, which taught that management of one's desires, removal of unnecessary fears, friendship, and virtuous living led to a pleasant life and constant happiness, the highest good.

(1596–1650) René Descartes was a French philosopher, scientist, logician, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science during the Renaissance era. Mathematics was paramount to his method of inquiry, and he connected the previously separate fields of geometry and algebra into analytic geometry.

John Locke was an English philosopher and physician, widely regarded as one of the most influential of the Enlightenment thinkers and commonly known as the "father of liberalism". His important works include A Letter Concerning Toleration (1689), Two Treatises of Government (1689/90), both published anonymously, and An Essay Concerning Human Understanding (1689/90). His writing on toleration contends that religion is a matter for the individual and that the churches are voluntary associations, ruling out religious coercion and uniformity; these lead to the idea of separation of church and state. His Two Treatises on Government argues for government based on the consent of the governed and the right to revolt against tyrannous government which has lost consent. The Two Treatises are believed to have influenced the language that Thomas Jefferson chose in his drafting the July 1776 Declaration of Independence during the War of American Independence.

(1724–1804) Immanuel Kant was a German philosopher. Born in Königsberg in the Kingdom of Prussia, he is considered one of the central thinkers of the Enlightenment. His comprehensive and systematic works in epistemology, metaphysics, logic, ethics, aesthetics, political theory, and the philosophy of religion have made him one of the most influential and highly discussed figures in modern Western philosophy.

David Hume was a Scottish philosopher, historian, economist and essayist who is known for his highly influential system of empiricism, philosophical scepticism and metaphysical naturalism. Beginning with A Treatise of Human Nature (1739–40), Hume strove to create a naturalistic science of man that examined the psychological basis of human nature. Following John Locke, Hume rejected the existence of innate ideas, holding that all our ideas derive ultimately from impressions, but in his fork he distinguished relations of ideas, known a priori, from matters of fact, whose knowledge rests on experience. This places him in the empiricist tradition of Locke and George Berkeley, while drawing his experimental method from Francis Bacon.

Friedrich Wilhelm Nietzsche was a German philosopher and writer who started his career as a classical philologist and turned to philosophy early in his academic career. In 1869, at age 24, he was appointed Professor of Classical Philology at the University of Basel. Plagued by health problems for most of his life, he resigned from the university in 1879. He afterward lived as an independent writer, spending much of his life in relative solitude and financial insecurity while moving between Switzerland, Italy, and southern France in search of climates that might alleviate his condition, and in the following decade, he completed much of his core writing. In 1889, aged 44, he suffered a neurological collapse, and thereafter a complete loss of his mental faculties, with paralysis and vascular dementia; he lived out his remaining 11 years, first under the care of his mother, and later his sister, until his death. His works and his philosophy have fostered not only extensive scholarship but also much popular interest.

(1889–1976) Martin Heidegger was a German philosopher whose work was central to the development of phenomenology, hermeneutics, and existentialism. He has had significant impact within subsequent philosophy, social sciences and humanities, and theology.

(1908–1986) Simone Lucie Ernestine Marie Bertrand de Beauvoir was a French existentialist philosopher, writer, social theorist, and feminist activist. Though she did not consider herself a philosopher, nor was she considered one at the time of her death, she had a significant influence on both feminist existentialism and feminist theory.

(1926–1984) Paul-Michel Foucault was a French historian of ideas and philosopher, who was also an author, literary critic, political activist, and teacher. Foucault's theories primarily addressed the relationships between power, knowledge and liberty, and he analyzed how they are used as a form of social control through multiple institutions. Though often cited as a structuralist and postmodernist, Foucault rejected these labels and sought to critique authority without limits on himself. His thought has influenced academics within a large number of contrasting areas of study, with this especially including those working in anthropology, communication studies, criminology, cultural studies, feminism, literary theory, psychology, and sociology. His efforts against homophobia and racial prejudice as well as against other ideological doctrines have also shaped research into critical theory and Marxism–Leninism alongside other topics.

Jean-Paul Charles Aymard Sartre was a French philosopher, playwright, novelist, screenwriter, political activist, biographer, and literary critic, considered a leading figure in 20th-century French philosophy and Marxism. Sartre was one of the key figures in the philosophy of existentialism. His work has influenced sociology, critical theory, post-colonial theory, and literary studies. He was awarded the 1964 Nobel Prize in Literature despite attempting to refuse it, saying that he always declined official honors and that "a writer should not allow himself to be turned into an institution."