The Roman History · Amm. 22.3.5

Pentadius also was destined for a similar sentence; the charge against him being that, having been sent on a mission by Constantius, he had made notes of the replies given by Gallus when he was examined on several subjects before he was put to death. But as he defended himself with justice, he was at last discharged.

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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