Roman Legion in late Antiquity

[Nathan Ross]

Is there not a tombstone that states the infantryman it belongs to was a member of the Xth cohort of his Legion, and isn't that tombstone dated to the 4th Century?

Just wanted to return to this point for a moment.

I was just looking at some of the inscriptions to II Italica Divitensis from the Via Flaminia, possibly dating from Constantine's advance on Rome in AD312. I notice that one of them, from Ocriculum, apparently mentions the cohort number as well:

AE 1982, 00258 (Ocriculum): D(is) M(anibus) Val(erius) Iustin/us miles legionis s/ecund(a)e Italic(a)e Divite/nsium civis R(a)etus / militavit annis V / vixit an(n)is XXV co(ho)r(ti)/s VII Secundus fra/tiri patri carissim/o bene merenti / memoriam feci/t

Does this mean that he was from the 7th cohort of his legion? If so, it perhaps means the Constantinian vexillation-legion that presumably evolved into the palatine legion Divitenses Seniores of the ND was, like the contemporary Herculia legions, organised into the traditional ten cohorts in the early fourth century...