The original authorities of the life of Constantine are Eusebius, Bishop of Cæsarea, his friend and admirer; also Hosius, of Cordova. The ecclesiastical histories of Socrates, Theodoret, Zosimus, and Sozomen are dry, but the best we have of that age. The lives of Athanasius and Arius should be read in connection. Gibbon is very full and exhaustive on this period. So is Tillemont, who was an authority to Gibbon. Milman has written, in his interesting history of the Church, a fine notice of Constantine, and so has Stanley. The German Church histories, especially that of Neander, should be read; also, Cardinal Newman’s History of the Arians. I need not remind the reader of the innumerable tracts and treatises on the doctrine of the Trinity. They comprise half the literature of the Middle Ages as well as of the Fathers. In a lecture I can only glance at some of the vital points.
