The Vexillation

[Flavivs Aetivs]

But 300 is not divisible by 80, or am I being particularly dense?

I calculate the Numerus as eight eighty-man centuries, totalling 640 men, plus officers (19 officers approximately: A centurio and biarchus for each century, making 16, plus a Senator (Herald), Primicerius (Sort of like a Second-In-Command, Camp Chief, and Quartermaster), and of course the Tribunis. I might be forgetting one or two. If it had Ducenarii it would be 23 officers.