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.