This I take to be the meening of that passage in Tacitus, "Reges ex nobilitate, duces ex virtute sumunt."
To do the duty of a duces tecum we have a diligence against havers.
In the Bible the word dukes is used (Gen. xxxvi) for the duces of the Vulgate.
The next are duces belli, great leaders in war; such as are princes' lieutenants, and do them notable services in the wars.
The Goths pursued the same plan; so too the Greeks, who replaced all counts by their own duces; and so also the Longobards.
Nam duces, ubi impetrando triumphalium insigni sufficere res suas crediderant, hostam omittebant.
duces autem contrarii excercitus, sese densis agminibus et consertis aciebus, uiolenter opponunt aduentantibus.
Evil always going to jail despite habeas corpuses, writs, and duces tecums.
duces ex judicio discedentes, ut ipsi omnibus iracundi flammis urebantur.
Isti duces vel reguli extiterunt principio gentis Francorum diversis temporibus.