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Traditionally, in the system that Augustus inherited from the Republic, the Roman command structure was class-based. As mentioned earlier, the officer class came from the narrow aristocracy of senators and equestrians. The great armies of the Republic were commanded by senators who had attained the rank of consul, the pinnacle of their society. Their training in military science came mainly from experience: until the later second century B.C., aspiring senators were required to serve in ten campaigns before they could hold political office 49 Intellectual education was brought to Rome by the Greeks and began to take hold in the Roman aristocracy sometime in the second century B.C.; thus it is the Greek Polybius who advocates a formal training for generals in tactics, astronomy, geometry, and history.50 And in fact some basic education in astronomy and geometry-which Polybius suggests would be useful for calculating, for example, the lengths of days and nights or the height of a city wall-was normal for a Roman aristocrat of the late Republic or the Principate. Aratus' verse composition on astronomy, several times translated into Latin, was especially popular.51 But by the late Republic the law requiring military service for office was long defunct; and Roman education as described by Seneca the Elder or Quintilian was designed mainly to produce orators. The emphasis was overwhelmingly on literature and rhetoric;52 one did not take courses, for example, on "modern Parthia" or military theory. Details of grammar and rhetorical style were considered appropriate subjects for the attention of the empire's most responsible individuals; this is attested in the letters of Pliny the Younger, the musings ofAulus Gellius, and the correspondence of Fronto with Lucius Verus and Marcus Aurelius.53
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Susan P. Mattern (Rome and the Enemy: Imperial Strategy in the Principate)