The Roman History · Amm. 21.1.2

And while anxiously considering these points he feared him, as likely to be in the one case a cruel friend, while in the other case he recollected that he had always been successful in civil disturbances. Above all things his anxiety was increased by the example of his brother Gallus, who had been betrayed by his own want of caution and the perjured deceit of certain individuals.

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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