The design of the Persian war is declared by Ammianus (xxii. 7, 12), Libanius (Orat. Parent. c. 79, 80, p. 305, 306 [Fabric. Bibl. Graec. ed. Hamb. 1715]), Zosimus (l. iii. [c. 11] p. 158), and Socrates (l. iii. c. 19).