Salvete Omnes,
a short post:
a 1991 work on the ancient Roman legionary cavalrymen aka equites legionis & equites promoti - from Academia- by Michael Pavkovic, a dissertation completed under prof. Michael P. Spiedel.
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illustrations are provided by the chisels of Abraham de Bruyn, from Wiki Commons - :)
The size of organization of the Equites Legionis and Euites Singulares
Valete