The Roman History · Amm. 16.10.7

Numbers also of the chief officers who went before him were surrounded by dragons embroidered on various kinds of tissue, fastened to the golden or jewelled points of spears, the mouths of the dragons being open so as to catch the wind, which made them hiss as though they were inflamed with anger; while the coils of their tails were also contrived to be agitated by the breeze.

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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