"This volume contains a systematic study of the twelfth book of Aristotle's Metaphysics by a distinguished group of scholars of ancient philosophy. Book Lambda, which can be regarded as a self-standing treatise on substance, has attracted particular attention in recent years, and was chosen as the focus of the fourteenth Symposium Aristotelicum." "The eleven papers published here were initially presented at the Symposium and revised in the light of ensuing discussion. Together they form a discursive commentary on points of philosophical interest in each chapter of Lambda. Michael Frede has added an extensive Introduction, which places the discussion of each chapter in the context of the book as a whole. This volume will be a resource of great value and interest for those working on ancient metaphysics and theology."--BOOK JACKET.