The Roman History · Amm. 18.7.5

They wander in countless droves among the beds of rushes on the banks of the rivers of Mesopotamia, and in the jungles; and lie quiet all the winter, which is very mild in that country. But when the warm weather returns, as these regions are exposed to great heat, they are forced out by the vapours, and by the size of the gnats, with swarms of which every part of that country is filled. And these winged insects attack the eyes, as being both moist and sparkling, sitting on and biting the eyelids; the lions, unable to bear the torture, are either drowned in the rivers, to which they flee for refuge, or else by frequent scratchings tear their eyes out themselves with their claws, and then become mad. And if this did not happen the whole of the East would be overrun with beasts of this kind.

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.