Note 76 — THE AUXILIA DURING THE FIRST TWO CENTURIES A.D.
Reading edition
xii. 2231 ‘[D] Decmanio Capro sub praef(ecto) equit(um) alae Agrippian(ae)’; v. Suppl. 185 ‘Ti. Iulio C. f., Fab(ia) Viatori subpraef(ecto) cohortis III Lusitanorum …’. The origin of this post may be due to Augustus’s practice of giving auxiliary regiments two praefecti, although this measure was primarily designed in the interest of officers of senatorial rank. Cf. Suet. Vit. Aug. 38 ‘binos plerumque laticlavios praeposuit singulis alis’. Von Domaszewski prefers to connect it with the early system of brigading several auxiliary regiments together under one commander; Rangordnung, p. 119.