Late Roman Unit Sizes

[Flavivs Aetivs]

I've found late Roman units to be of 3 organizational systems:

1. Pre-Severan Legions: Generally these are organized into 3 detachments numbering (based on my estimates) 1500 men each (4500 men total) although some are divided into 2 detachments.

2. 3rd Century and Diocletianic Legions: These seem to usually be divided into Seniores and Juniores and number 3000 men. There also those like Sexta Parthica which probably number 3000 men even though they are not divided.

3. Post-Constantian units: These usually number 1500 men, or sometimes are Juniores and Seniores totalling 3000 men.

EDIT: As for Cavalry, I thoroughly agree they number 360 men. Although Turmae were units underneath the greater Cavalry unit: there were... I think 10 Turmae in an Ala? I can't recall.