The Roman History · Amm. 27.6.5

And when everything was prepared, and the consent of the soldiers secured, in order that all men might willingly accept the new emperor, immediately upon the arrival of Gratian, Valentinian advancing into the open space, mounted the tribune, and surrounded by a splendid circle of nobles and princes, and holding the boy by his right hand, showed him to them all, and in the following formal harangue recommended their intended sovereign to the army.

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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