Ctesiphon

Both built themselves new capitals, the Persian in Ctesiphon in Mesopotamia; the Romans in Constantinople.

Hitherto all had indicated an intention on the part of Julian to occupy Ctesiphon, and thence dictate a peace.

My friend Ctesiphon brought me hither, and I know nothing of our host except the report of his riches and liberality.

Julian and his advisers must have seen at a glance that if the Romans were not to attack Ctesiphon, they must retreat.