Late Roman Unit Sizes

[Nathan Ross]

I maintain there was a standardized regiment called a numerus.

But why is this necessary? We know that there were various different types of unit in the late army, called legiones, auxilia, vexillationes, cuneii etc. We also know that most, or perhaps all, of these units could be referred to as numeri.

So why should we assume the existence of another type of unit (if that's what you're suggesting) of a fixed size, solely called a numerus?

It seems to be adding an extra level of complexity to what's already a quite complex picture!