The document provides an overview of ancient Greek philosophy from the Pre-Socratic period to the Classical age. It discusses key early philosophers like Thales, Anaximander, and Hippocrates who investigated the physical world and natural laws. It then covers the Classical age philosophers Socrates, Plato, and Aristotle. Socrates pioneered questioning beliefs and challenging assumptions. Plato documented Socrates' teachings and analyzed politics and the limits of knowledge. Aristotle was a student of Plato who founded his own academy and made vast contributions across many fields, establishing himself as one of history's greatest thinkers.