Diodorus now presbyter of Antioch, did not become bishop of Tarsus till about the time of Basil’s death.  On his services to the Church at Antioch, cf. Theod., H.E. ii. 19. and Soc., H.E.vi. 8.  The controversy as to his alleged Nestorianism belongs to a later date.  On the relations between Diodorus and Apollinarius, cf. Dorner, Christ. i. pp. 976 and 1022.