The Roman History · Amm. 23.1.1

To pass over minute details, these were the principal events of the year. But Julian, who in his third consulship had taken as his colleague Sallustius, the prefect of Gaul now entered on his fourth year, and by a novel arrangement took as his colleague a private individual; an act of which no one recollected an instance since that of Diocletian and Aristobulus.

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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