The Roman History · Amm. 30.5.16

For a very few days before some of those comets, which ever give token of the ruins of lofty fortunes, and of which we have already explained the origin, appeared in the heavens. Also, a short time before, a thunderbolt fell at Sirmium, accompanied with a terrific clap of thunder, and set fire to a portion of the palace and senate-house: and much about the same time an owl settled on the top of the royal baths at Sabaria, and pouring forth a funeral strain, withstood all the attempts to slay it with arrows or stones, however truly aimed, and though numbers of people shot at it in diligent rivalry.

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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