A distinguished group of Aristotelian scholars and contemporary metaphysicians discusses Aristotle's theory of the unity and identity of substances. The questions of ontology, explanation, and methodology with which they deal remain central to metaphysics today. This book sets a new agenda for Aristotelian metaphysics.

"A Companion to Ancient Philosophy" provides a comprehensive and current overview of the history of ancient Greek and Roman philosophy from its origins until late antiquity.Comprises an extensive collection of original essays, featuring contributions from both rising stars and senior scholars of ancient philosophyIntegrates analytic and continental traditionsExplores the development of various disciplines, such as mathematics, logic, grammar, physics, and medicine, in relation to ancient philosophyIncludes an illuminating introduction, bibliography, chronology, maps and an index