A new analysis of the theological concept of divine mediation, which was central to the Arian controversy of the early fourth century. Jon M. Robertson illustrates the variety of perspectives within the debate, as well as showing the theological backdrop of Athanasius' insight on Christ as mediator. This is an important book for the study of fourth century theology, and will no doubt also prove to be of wider interest: historical and systematic theologians alike will find that this excellent monograph generously repays serious reading.