The famous ancient philosopher who taught Alexander the Great was Aristotle. Born in 384 BCE, Aristotle was a student of Plato and later became a celebrated philosopher in his own right. He was appointed as the tutor to Alexander when the future king was about 13 years old, providing him with a comprehensive education that included subjects such as philosophy, science, literature, and politics. This education significantly influenced Alexander's worldview, instilling in him a sense of curiosity and the pursuit of knowledge. Aristotle's teachings shaped Alexander’s approach to governance and military strategy, contributing to his legacy as one of history’s great conquerors.