The Roman History · Amm. 16.4.3

At last, after thirty days, the barbarians retired disappointed, murmuring that they had been so vain and weak as to attempt the siege of such a city. It deserves however to be remarked, as a most unworthy circumstance, that when Julian was in great personal danger, Marcellus, the master of the horse, who was posted in the immediate neighbourhood, omitted to bring him any assistance, though the danger of the city itself, even if the prince had not been there, ought to have excited his endeavours to relieve it from the peril of a siege by so formidable an enemy.

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
Passage preview. Read in context for the complete text, notes and references.