Ammianus, xvii. 5, and Valesius ad loc. The sophist, or philosopher (in that age these words were almost synonymous), was Eustathius the Cappadocian, the disciple of Jamblichus, and the friend of St. Basil. Eunapius (in vit. Aedesii, p. 44-47) fondly attributes to this philosophic ambassador the glory of enchanting the barbarian king by the persuasive charms of reason and eloquence. See Tillemont, Hist. de Empereurs, tom. iv. p. 828, 1132.