Augustus was now aged, and might submit to the affront without resenting it.
He had lately lost the services of his best general, Tiberius, who, indignant at slights put upon him, had gone into retirement at Rhodes.
He had no one that he could employ but his grandsons, youths who had not yet fleshed their maiden swords.

Phraates probably hoped that Augustus would draw back before the terrors of a Parthian war under such circumstances, and would allow without remonstrance the passing of Armenia into the position of a subject-ally of Parthia.
But if these were his thoughts, he had miscalculated.

Augustus, from the time that he heard of the Armenian troubles, and of the support given to them by Parthia, seems never to have wavered in his determination to vindicate the claims of Rome to paramount influence in Armenia, and to have only hesitated as to the person whose services he should employ in the business.

He would have been glad to employ Tiberius; but that morose prince had deserted him and, declining public life, had betaken himself to Rhodes, where he was living in a self-chosen retirement.
Caius, the eldest of his grandsons, was, in B.C.2, only eighteen years of age; and, though the thoughts of Augustus at once turned in this direction, the extreme youth of the prince caused him to hesitate somewhat; and the consequence was that Caius did not start for the East till late in B.C.1.

Meanwhile a change had occured in Parthia.
Phraates, who had filled the throne for above thirty-five years, ceased to exist, and was succeeded by a young son, Phraataces, who reigned in conjunction with the queen-mother, Thermusa, or Musa.
The circumstances which brought about this change were the following.
Phraates IV.