Zeno of Citium

Philosopher · 470 BC – 399 BC

Socrates was a classical Greek philosopher credited as a founder of Western philosophy, famous for the Socratic method of questioning and for his trial and execution in Athens.

• Socratic method
• The examined life

Why Zeno was inspired by accounts of Socrates' virtue and self-mastery to pursue philosophy.

Emperor · 121 – 180

Marcus Aurelius was a Roman emperor and Stoic philosopher, the last of the "Five Good Emperors", whose private journal, the Meditations, is the most cherished work of Stoic thought.

• The Meditations
• Stoic philosophy

Why The Stoicism Zeno founded reached its most famous expression in Marcus Aurelius's Meditations.

Philosopher · 1632 – 1677

Baruch Spinoza was a Dutch philosopher of the early modern era whose rationalist masterpiece, the Ethics, advanced a radical monism identifying God with Nature and made him a foundational figure of modern thought.

• Ethics
• Pantheism (God or Nature)

Why Also a philosopher · Comparable historical impact

Economist · 1723 – 1790

Adam Smith was a Scottish Enlightenment philosopher and economist, the father of modern economics, whose work The Wealth of Nations laid the foundations of free-market thought.

• The Wealth of Nations
• The invisible hand

Why Also a philosopher · Comparable historical impact

Writer · 1894 – 1963

Aldous Huxley was an English writer and philosopher whose dystopian novel Brave New World became one of the most influential warnings of the 20th century, imagining a future enslaved not by terror but by pleasure and conditioning.

• Brave New World
• The Doors of Perception

Why Also a philosopher · Comparable historical impact

Theologian · 354 – 430

Augustine of Hippo was a Roman North African theologian and philosopher whose works, including Confessions and City of God, shaped Western Christianity and laid intellectual foundations for medieval and modern thought.

• Confessions
• City of God

Why Also a philosopher · Comparable historical impact

Philosopher · 1126 – 1198

Averroes was a philosopher and polymath of Al-Andalus whose commentaries on Aristotle profoundly shaped medieval European philosophy and the relationship between reason and faith.

• Commentaries on Aristotle
• Defending reason and philosophy

Why Also a philosopher · Comparable historical impact

Philosopher · 384 BC – 322 BC

Aristotle was a Greek philosopher and polymath whose writings on logic, ethics, biology, politics and metaphysics shaped Western thought for over two millennia.

• Formal logic
• Virtue ethics

Why Also a philosopher · Worked in logic & ethics

Philosopher · 428 BC – 348 BC

Plato was a Greek philosopher who founded the Academy in Athens, wrote the foundational dialogues of Western philosophy, and developed the influential theory of Forms.

• Theory of Forms
• The Academy

Why Also a philosopher · Worked in ethics

Mathematician · 570 BC – 495 BC

Pythagoras was an ancient Greek mathematician and philosopher who founded the Pythagorean school and is remembered for the Pythagorean theorem and the idea that number underlies the cosmos.

• Pythagorean theorem
• Pythagoreanism

Why Also a philosopher · Active in the same era

Philosopher · 1724 – 1804

Immanuel Kant was a German philosopher of the Enlightenment, one of the most influential thinkers in history, who reconciled rationalism and empiricism and transformed ethics, metaphysics and epistemology.

• Critique of Pure Reason
• The categorical imperative

Why Also a philosopher · Worked in ethics

Physician · 980 – 1037

Avicenna was a Persian polymath of the Islamic Golden Age, one of the greatest physicians and philosophers of the medieval world, whose Canon of Medicine was a standard text for six centuries.

• The Canon of Medicine
• The Book of Healing

Why Also a philosopher · Worked in logic

Theologian · 1225 – 1274

Thomas Aquinas was a medieval Italian theologian and philosopher whose synthesis of Christian theology and Aristotelian philosophy became central to Catholic thought and the high point of scholasticism.

• Summa Theologica
• Reconciling faith and reason

Why Also a philosopher · Worked in ethics

Philosopher · 571 BC – 471 BC

Laozi was a semi-legendary ancient Chinese philosopher traditionally regarded as the founder of Daoism and the author of the Tao Te Ching, the foundational text on living in harmony with the Dao.

• Founding Daoism
• Tao Te Ching

Why Also a philosopher · Worked in ethics

Biographer · 46 – 120

Plutarch was a Greek philosopher and biographer of the Roman era whose Parallel Lives paired famous Greeks and Romans and became one of the most read and influential works of biography in history.

• Parallel Lives
• Moralia

Why Also a philosopher · From the same civilization

Philosopher · 551 BC – 479 BC

Confucius was a Chinese philosopher and teacher whose ideas on ethics, family and good government became the foundation of Confucianism and shaped East Asian civilization for over two thousand years.

• Confucianism
• The Analects

Why Also a philosopher · Worked in ethics

Spiritual Leader · 563 BC – 483 BC

Siddhartha Gautama, known as the Buddha, was a spiritual teacher of ancient India whose insights into suffering and liberation founded Buddhism, now one of the world's major religions.

• Founding Buddhism
• The Four Noble Truths

Why Also a philosopher · Worked in ethics

Military Leader · 356 BC – 323 BC

Alexander the Great was the king of Macedon who built one of the largest empires in history by his early thirties, spreading Greek culture across three continents.

• Conquest of Persia
• The Hellenistic Age

Why Active in the same era · From the same civilization

Mathematician · 287 BC – 212 BC

Archimedes was an ancient Greek mathematician, physicist and inventor, widely regarded as the greatest mathematician of antiquity and a founder of mathematical physics and engineering.

• Archimedes' principle
• Calculating pi

Why Active in the same era · From the same civilization

Mathematician · 325 BC – 265 BC

Euclid was an ancient Greek mathematician, the "father of geometry", whose treatise the Elements is the most influential mathematics textbook ever written.

• The Elements
• Euclidean geometry

Why Active in the same era · From the same civilization

Historian · 484 BC – 425 BC

Herodotus was a Greek writer of the 5th century BC, called the "Father of History" for his Histories, the first known work to systematically investigate and narrate past events as a connected inquiry.

• The Histories
• Father of History

Why Active in the same era · From the same civilization

Physician · 460 BC – 370 BC

Hippocrates was an ancient Greek physician regarded as the father of Western medicine, who established medicine as a rational discipline distinct from superstition and inspired the Hippocratic Oath.

• Father of medicine
• The Hippocratic Oath

Why Active in the same era · From the same civilization

Poet · b. 800 BC

Homer was the legendary ancient Greek poet to whom the great epics the Iliad and the Odyssey are attributed, foundational works of Western literature.

• The Iliad
• The Odyssey

Why Active in the same era · From the same civilization

Historian · 460 BC – 400 BC

Thucydides was an Athenian historian and general whose History of the Peloponnesian War set the standard for rigorous, evidence-based history and remains a foundational text of political and military analysis.

• History of the Peloponnesian War
• Scientific history

Why Active in the same era · From the same civilization