Zodiac and Late Roman Army Organisation

[Robert Vermaat]

The Western Notitia was believed to be written by Ioannes (I believe the same one that usurped in 423 with Aetius' support) in the Early 420s.

Can't recall ever seeing it attributed so before - any reference I could follow up?

Me neither. The agreement is that the basic document was penned down c. 394, and that while the text of the Eastern part remained unchanged, additions were made to the document describing the Western part, until c. 420 (although that remains unsure). That 'Ioannes wrote' the western Notitia cannot be right, as they belong to the same document. Who exactly made the additions (which department) also remains unclear - we're not even sure why it was written in the first place!