The Roman History · Amm. 29.1.18

Valens, therefore, was to be excused for taking every precaution to defend his life, which traitors were endeavouring to take. But it was an unpardonable fault in him that, through tyrannical pride, he, with haste and with inconsiderate and malicious persecution, inflicted the same severities on the innocent as on the guilty, making no distinction between their deserts; so that while the judges were still doubting about their guilt, the emperor had made up his mind about their punishment, and men learnt that they were condemned before they knew that they were suspected.

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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