Socrates Teaches in Athens

Socrates (~470–399 BCE) walked around Athens questioning literally everything — morality, justice, knowledge, the meaning of life. He never wrote anything down; we only know his ideas through his student Plato. Athens eventually got so tired of his questions they sentenced him to death by hemlock. He could've escaped but chose to drink the poison on principle. The original 'I'd rather die than stop being real.' Most influential philosopher ever, no cap.