The Roman History · Amm. 24.2.21

And when this was granted, Mamersides, the commander of the garrison, was let down by a rope, and conducted to the emperor as he desired; and having received a promise of his own life, and of impunity to all his comrades he was allowed to return to the city. And when he related what had been done, the citizens unanimously agreed to follow his advice and accept the terms; and peace was solemnly made with all the sanctions of religion, the gates were thrown open, and the whole population went forth proclaiming that a protecting genius had shone upon them in the person of the great and merciful Cæsar.

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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