Their prison was an ancient palace, the residence of the kings of Cappadocia; the situation was pleasant, the buildings of stately, the enclosure spacious.

They pursued their studies, and practised their exercises, under the tuition of the most skilful masters; and the numerous household appointed to attend, or rather to guard, the nephews of Constantine, was not unworthy of the dignity of their birth.

But they could not disguise to themselves that they were deprived of fortune, of freedom, and of safety; secluded from the society of all whom they could trust or esteem, and condemned to pass their melancholy hours in the company of slaves devoted to the commands of a tyrant who had already injured them beyond the hope of reconciliation.

At length, however, the emergencies of the state compelled the emperor, or rather his eunuchs, to invest Gallus, in the twenty-fifth year of his age, with the title of Caesar, and to cement this political connection by his marriage with the princess Constantina.
After a formal interview, in which the two princes mutually engaged their faith never to undertake any thing to the prejudice of each other, they repaired without delay to their respective stations.

Constantius continued his march towards the West, and Gallus fixed his residence at Antioch; from whence, with a delegated authority, he administered the five great dioceses of the eastern praefecture.