Acknowledgements; Introduction; 1. The Myth and the Logos; 1.1. Order and Chaos; 1.2 Mythical Battlefields: Monstrosity as a Weapon; 1.3. Causality and Monstrosity: Challenging Zeus; 2. The Pre-Platonic philosophers; 2.1. Anaxagoras: A Material Origin for Life and Monstrosity; 2.2. Empedocles: Wonders to Behold; 2.3. Democritus: Agonism within Matter; 3. Plato; 4. Aristotle; 5. Epicurus and Lucretius; 5.1. An Immanent Causality for an Infinite Universe; 5.2. Zoogony, Monstrosity, and Nature’s Normativity; 5.3. Concourses of Nature; 5.4. Lucretius’s Impact on the Augustan Age; 6. Stoicism; 6.1. Nominalism; 6.2. Good and Evil, Beauty and Ugliness; 6.3; Providence, God, and Teleology; 7. Scepticism; 7.1. The Tropes and the Critique of Essentialism; 7.2. To What Purpose? 8. Middle and Neoplatonism; 8.1 The Material World and the Rediscovery of Transcendence; 8.2. Demons; 8.3. The World Order; Bibliography; Index Locorum; Index Verborum; Index Rerum; Index Nominum.