Ancient Greece

In 399 BC, Athens voted to execute its most famous philosopher. The charge was impiety and corrupting the youth. The vote was 280 to 220. The method: hemlock. Watching from the crowd was a young man named Plato - aristocratic, brilliant, and about to have his faith in Athenian democracy destroyed forever. What followed was one of the most consequential acts of grief in intellectual history. Plato spent the next fifty years answering a single question that Socrates's death forced him to ask: how does a just city make decisions - and how do you build one that doesn't execute its wisest citizens while elevating its worst? The Republic, the Academy, the theory of Forms - all of it flows from that verdict. Athens thought it was silencing a troublesome voice. It handed Plato everything he needed to change the world.