To put it bluntly: the christological doctrinal decisions of the councils of Ephesus (431) to Constantinople (680/81) required a procedural "framing". Or again to put it another way: Convincing Theologie based on professential bureaucracy. Thomas Graumann addresses this issue in his monograph, in which numerous preliminary work from a decade and a half has been incorporated.
Thomas Graumann is Reader in Ancient Christian History and Patristic Studies at the University of Cambridge and Professor for Patristics at the Humboldt University in Berlin.