The Roman History · Amm. 30.3.7

But subsequently he died in the country of the Franks, which he had invaded and ravaged in a most destructive manner, till at last he was cut off by the manœuvres of Mellobaudes, the warlike king of that nation, and slain. After the treaty had thus been solemnly ratified, Valentinian retired into winter quarters, at Treves.

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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