The Roman History · Amm. 26.4.3

And after that, when he reached Constantinople, revolving many considerations in his mind, and considering that he himself was already overwhelmed with the magnitude of pressing business, he thought that the emergency would admit of no delay; and on the 28th of March he led Valens into the suburbs, where, with the consent of all men (and indeed no one dared to object), he declared him emperor, had him clothed in the imperial robes, and crowned with a diadem, and then brought him back in the same carriage with himself as the legitimate partner of his power, though in fact he was to be more like an obedient servant, as the remainder of my narrative will show.

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.