379. Theodosius is proclaimed Augustus. Death of St. Basil and of St. Ephrem Syrum. Gratian, on his way back from Thrace, requests St. Ambrose to come to meet him and receives the first two books of the treatise De Fide, and asks for a further one of the Holy Spirit; the latter was written two years later. Death of Satyrus, brother of St. Ambrose. The two treatises on his death written.