The Roman History · Amm. 16.9.3

And when, by the concurrent report of spies, these officers had become certain that Sapor was occupied in the most remote frontier of his kingdom in repelling the hostilities of the bordering tribes, which he could not accomplish without great difficulty and bloodshed, they sought to tamper with Tamsapor, the general in command in the district nearest our border. Accordingly they sent soldiers of no renown to confer with him secretly, to engage him, if opportunity served, to write to the king to persuade him to make peace with the Roman emperor; whereby he, being then secure on every side, might be the better able to subdue the rebels who were never weary of exciting disturbances.

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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