A detailed study of one theological concept (divine mediation) that was central to the Christological controversy of the early fourth century. By analysing the views of three participants at the Council of Nicaea (325), Jon M. Robertson demonstrates the variety of perspectives in a way that questions popular approaches to the period that see the controversy as having only two sides. His analysis constitutes a new approach to the early Arian controversy, as well as showing the theological backdrop of Athanasius' insight on Christ as mediator. It further demonstrates the contemporary relevance of the issue by giving an Athanasian critique of the modern Christology of Roger Haight.