Up to now there has been a lack of comprehensive elucidation and exposition in Western writing on the history of doctrine in Post Chalcedonian christology of the patristic period. Here in Volume Two, Part One, Professor Grillmeier continues his monumental work, Christ in Christian Tradition. First he lays the foundations, surveys the present state of research, and then goes on to give an exposition covering the development of the discussion about Chalcedon from AD 451 to the beginning of the reign of Emperor Justinian I.