The Roman History · Amm. 16.9.2

But Musonianus, the prefect of the prætorium, a man, as we have already said, of many liberal accomplishments but corrupt, and a person easily turned from the truth by a bribe, acquired, by means of some emissaries who were skilful in deceiving and obtaining information, a knowledge of the plans of the Persians; taking to his counsels on this subject Cassianus, duke of Mesopotamia, a veteran who had served many campaigns, and had become hardened by all kinds of dangers.

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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