This volume is not an historical study of the origins and development of medieval approaches to theories of transcendentals. Its point of departure is rather the role that transcendentals played in natural theology and metaphysical theories of the 13th and 14th centuries. Accordingly, the effort of John Duns Scotus (1265/6-1308) to systematize a theory of transcendental concepts provides the central inspiration for this book. The theories in focus are not only linked to metaphysical issues, but come to constitute the understanding of metaphysics as "First Philosophy". In the wake of the 13th-century reception of Aristotle, Scotus inaugurates a new beginning for the "science of reality as a whole", adumbrating theoretical elements that have exercised a remarkable influence on the history of philosophy and continue to do so today. The essays in this volume evaluate the innovations that his work inspired, and in this sense each of them is itself innovative. They offer a candid evaluation of the extrinsic and intrinsic merits of the Scotist interpretation - that is, they examine just how original the intepretation is within the history of ideas, and assess its internal consistency. In doing so, they take account of earlier philosophical attempts to understand both the interrelationship of transcendentals and the science of metaphysics. They also offer topical and expanded analyses of various elements of Scotus's theory, as well as of its influence and developments within Scotist circles and the Franciscan tradition, as well as within Spanish scholasticism and the philosophical theology of our times.