The change in the sentiments, or at least in the conduct of Constantine, may be traced in Eusebius (in Vit. Constant. 1. iii c. 23, 1. iv. c. 41), Socrates (1. i. c. 23-39), Sozomen (I.ii. c. 16-34), Theodoret (1. i. c. 14-34), and Philostorgius (l.ii. c. 1 -17). But the first of these writers was too near the scene of action, and the others were too remote from it. It is singular enough that the important task of continuing the history of the church should have been left for two laymen and a heretic.