Book excerpt: The Philosophy of Knowledge: A History presents the history of one of Western philosophy's greatest challenges: understanding the nature of knowledge. Divided chronologically into four volumes, it follows conceptions of knowledge that have been proposed, defended, replaced, and proposed anew by ancient, medieval, modern and contemporary philosophers. This volume covers the influence of Aristotle and Augustine during the Middle Ages. With original insights into the vast sweep of ways in which philosophers have sought to understand knowledge, The Philosophy of Knowledge: A History embraces what is vital and evolving within contemporary epistemology. Overseen by an international team of leading philosophers and featuring 50 specially-commissioned chapters, this is a major collection on one of philosophy's defining topics.