Sextus Rufus (c. 26), who on this occasion is no contemptible authority, affirms that the Persians sued in vain for peace, and that Constantine was preparing to march against them: yet the superior weight of the testimony of Eusebius obliges us to admit the preliminaries, if not the ratification, of the treaty. See Tillemont, Hist. des Empereurs, tom. iv. p. 420.