92. Zosimus, 1. ii. [c. 20] p. 93. Anonym. Valesian, p. 713. Eutropius, x. 4. Aurelius Victor, Euseb. in Chron. [An. CCCXVIII.] Sozomen, l. i. c. 2. Four of these writers affirm that the promotion of the Caesars was an article of the treaty. It is however certain that the younger Constantine and Licinius were not yet born; and it is highly probable that the promotion was made the 1st of March, A.D. 317. The treaty had probably stipulated that the two Caesars might be created by the western, and one only by the eastern emperor; but each of them reserved to himself the choice of the persons.