Name change on enlistment

[Nathan Ross]

Isodorus, an Alexandrian...Julius Martialis, soldier of the First Cohort of Thebans

Thanks! It does seem that a lot of people in Egypt had two different names. It does seem odd though - why didn't he just call himself Julius Isidorus, which seems perfectly reasonable? Perhaps that would imply he'd gained citizenship... but calling himself Julius Martialis would make it appear that way anyway. Legal thing, maybe?

(was I right about the Concordia inscription, by the way?)