This book is a collection of texts designed to illustrate the development of Christian thought about the person of Christ in the era of the church fathers. The earliest text translated comes from the latter half of the second century, when the ideas and problems which were to dominate christological thought in this period were first crystallized. The latest is the well-known 'Definition of the Faith' of the Council of Chalcedon (A.D. 451), which has generally been accepted as defining the limits of christological orthodoxy.