The Roman History · Amm. 27.5.1

After Procopius had been overpowered in Phrygia, and all material for domestic discords had thus been removed, Victor, the commander of the cavalry, was sent to the Goths to inquire, without disguise, why a nation friendly to the Romans, and bound to it by treaties of equitable peace, had given the support of its arms to a man who was waging war against their lawful emperor. And they, to excuse their conduct by a valid defence, produced the letters from the above-mentioned Procopius, in which he alleged that he had assumed the sovereignty as his due, as the nearest relation to Constantine's family; and they asserted that this was a fair excuse for their error.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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