In lecture three, we study the philosophy of Plato, focusing on his dialogues and the emergence of his metaphysical and epistemological ideas. Dr. Orr traces the historical and intellectual context of 5th century Athens, highlighting the influence of the sophists and Socrates on Plato's thought, and examines key dialogues such as the Apology, Crito, Phaedo, Gorgias, Meno, and Republic. We also undertake an analysis of Plato's famous Allegory of the Cave and its implications for his Theory of Forms and the nature of knowledge and reality.