The Roman History · Amm. 26.8.7

There, as it happened, he met Serenianus, who was at that time the count of the guards, and who had been sent to protect the treasury, and who now, with a garrison collected in a hurry, had undertaken the defence of the city, which was impregnable in its walls, and celebrated also for many ancient monuments, though Procopius, in order, now that he had got possession of Bithynia, to make himself master of the Hellespont, had sent a strong force to besiege it.

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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