Res Gestae

Now the first kind of plague is called endemic, and causes those who live in places that are too dry to be cut off by frequent fevers. The second is epidemic, which breaks out at certain seasons of the year, dimming the sight of the eyes and causing a dangerous flow of moisture. The third is loemodes,[*](Pestilential.) which is also periodic, but deadly from its winged speed.

After we had been exhausted by this destructive plague and a few had succumbed to the excessive heat and still more from the crowded conditions, at last on the night following the tenth day the thick and gross exhalations were dispelled by light showers, and sound health of body was regained.

But meanwhile the restless Persian was surrounding the city with sheds and mantlets, and mounds began to be raised and towers were constructed; these last were lofty, with ironclad fronts, and on the top of each a ballista was placed, for the purpose of driving the defenders from the ramparts; yet not even for a moment did the skirmishing by the slingers and archers slacken.