In 446 BC, Athens and Sparta signed the Thirty Years' Peace, a treaty meant to end the First Peloponnesian War and keep the peace for a generation. It lasted barely fifteen years. In this episode, Lucas and Luna explore how the peace was negotiated, why it collapsed, and how the tensions it failed to resolve fueled the catastrophic Peloponnesian War. They discuss the key players—Pericles, the Spartan king Pleistoanax, and the Athenian ambassador Callias—the treaty's territorial clauses, and the disputes over Potidaea, Corcyra, and Megara that ultimately made war inevitable. Drawing on Thucydides and modern historians, they ask whether the peace was doomed from the start or a missed opportunity. A story of diplomacy, brinkmanship, and the fragile logic of deterrence that resonates today. If you've ever wondered why treaties fail, this episode offers a case study from the ancient world that still speaks to our own era of great-power competition.