The term dux, which had already appeared in the Republican period with the general meaning of ‘a leader in a military action or of a troop of soldiers’ (cf. e.g. Cic. Dom. 12: seditionis duces), was in the 2nd cent. AD occasionally used in a semi-official way as the title for the commander of a military unit established for a particular purpose and not necessarily subordinate to the governor of a province. Thus Ti. Claudius Candidus was dux exercitus Illyrici in the war waged by Septimius Severus …
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Campbell, J. Brian (Belfast) and
Tinnefeld, Franz (Munich),
Brill’s New Pauly, Antiquity volumes edited by: Hubert Cancik and , Helmuth Schneider, English Edition by: Christine F. Salazar, Classical Tradition volumes edited by: Manfred Landfester, English Edition by: Francis G. Gentry.
Consulted online on 30 May 2020 <http://dx.doi.org/10.1163/1574-9347_bnp_e325340>