officers who taught soldiers their
drill and exercises (Veget. 1.13, 2.23, 3.6, 8, 26: Lamprid. Alex.
53; Atom. xv, 3.10; Orelli, Inscr,
3495). In the times of the republic this duty was discharged by a centurion,
or veteran soldier of merit and distinction. (Cf. Plin. Pan.