Nicephorus Gregoras was a fourteenth-century man of letters living in Constantinople who wrote a history of his own times. This work is an example of the traditional school of Byzantine historial writing in that it consists of an introductory summary of earlier history and a much fuller account of events contemporary with the author. But it departs from tradition in that it deals as much, or more, with ecclesiastical as with civil affairs. Gregoras was deeply implicated in the hesychast controversy, which began simply as a dispute among monks, but developed into a crisis of state, and his concern with it, in his life as well as his history, serves to illustrate its scope and importance. He was aware that his history lacked balance and needed some excuse. But the literary deficiencies of the work may be offset by its value as historical evidence. Since it was the hesychast doctrine, opposed by Gregoras, which became officially accepted, it is interesting to read the account of a defeated partisan. One must not, however, expect dispassionate reporting from Gregoras, although his account has sometimes been taken as such by western theologians.