DIO CASSIUS,
Roman History LIV.31
LIV.31
When now Agrippa, whom he loved because of his excellence and not because of any kinship, was dead, Augustus felt the need of an assistant in the public business, one who would far surpass all the others in both rank and influence, so that he might transact all business promptly and without being the object of envy and intrigue. Therefore he reluctantly chose Tiberius; for his own grandsons were still boys at the time. He first made him, as he had made Agrippa, divorce his wife, though she was the daughter of Agrippa by a former marriage and was bringing up one child and was about to give birth to another; and betrothed Julia to him, he sent him out against the Pannonians. This people had for a time been quiet through fear of Agrippa, but now after his death they revolted, Tiberius subdued them after ravaging much of their country and doing much injury to the inhabitants, making as much use as possible of his allies the Scordisci, who were neighbors of the Pannonians and were similarly equipped. He took away the enemy’s arms and sold most of the men of military age into slavery, to be deported from the country. For these achievements the senate voted him a triumph, but Augustus did not permit him to celebrate it, though he granted him the triumphal honors instead.