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[ Polyb. l. xvii. (xviii. 9.)]
The cavalry, without which the force of the legion would have remained imperfect, was divided into ten troops or squadrons; the first, as the companion of the first cohort, consisted of a hundred and thirty-two men; whilst each of the other nine amounted only to sixty-six. The entire establishment formed a regiment, if we may use the modern expression, of seven hundred and twenty-six horse, naturally connected with its respective legion, but occasionally separated to act in the line, and to compose a part of the wings of the army. [50] The cavalry of the emperors was no longer composed, like that of the ancient republic, of the noblest youths of Rome and Italy, who, by performing their military service on horseback, prepared themselves for the offices of senator and consul; and solicited, by deeds of valor, the future suffrages of their countrymen. [51] Since the alteration of manners and government, the most wealthy of the equestrian order were engaged in the administration of justice, and of the revenue; [52] and whenever they embraced the profession of arms, they were immediately intrusted with a troop of horse, or a cohort of foot. [53] Trajan and Hadrian formed their cavalry from the same provinces, and the same class of their subjects, which recruited the ranks of the legion. The horses were bred, for the most part, in Spain or Cappadocia. The Roman troopers despised the complete armor with which the cavalry of the East was encumbered. Their more useful arms consisted in a helmet, an oblong shield, light boots, and a coat of mail. A javelin, and a long broad sword, were their principal weapons of offence. The use of lances and of iron maces they seem to have borrowed from the barbarians. [54]
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[ Veget. de Re Militari, l. ii. c. 6. His positive testimony, which might be supported by circumstantial evidence, ought surely to silence those critics who refuse the Imperial legion its proper body of cavalry. Note: See also Joseph. B. J. iii. vi. 2.—M.]
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[ See Livy almost throughout, particularly xlii. 61.]
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[ Plin. Hist. Natur. xxxiii. 2. The true sense of that very curious passage was first discovered and illustrated by M. de Beaufort, Republique Romaine, l. ii. c. 2.]
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[ As in the instance of Horace and Agricola. This appears to have been a defect in the Roman discipline; which Hadrian endeavored to remedy by ascertaining the legal age of a tribune. * Note: These details are not altogether accurate. Although, in the latter days of the republic, and under the first emperors, the young Roman nobles obtained the command of a squadron or a cohort with greater facility than in the former times, they never obtained it without passing through a tolerably long military service. Usually they served first in the prætorian cohort, which was intrusted with the guard of the general: they were received into the companionship (contubernium) of some superior officer, and were there formed for duty. Thus Julius Cæsar, though sprung from a great family, served first as contubernalis under the prætor, M. Thermus, and later under Servilius the Isaurian. (Suet. Jul. 2, 5. Plut. in Par. p. 516. Ed. Froben.) The example of Horace, which Gibbon adduces to prove that young knights were made tribunes immediately on entering the service, proves nothing. In the first place, Horace was not a knight; he was the son of a freedman of Venusia, in Apulia, who exercised the humble office of coactor exauctionum, (collector of payments at auctions.) (Sat. i. vi. 45, or 86.) Moreover, when the poet was made tribune, Brutus, whose army was nearly entirely composed of Orientals, gave this title to all the Romans of consideration who joined him. The emperors were still less difficult in their choice; the number of tribunes was augmented; the title and honors were conferred on persons whom they wished to attack to the court. Augustus conferred on the sons of senators, sometimes the tribunate, sometimes the command of a squadron. Claudius gave to the knights who entered into the service, first the command of a cohort of auxiliaries, later that of a squadron, and at length, for the first time, the tribunate. (Suet in Claud. with the notes of Ernesti.) The abuses that arose caused by the edict of Hadrian, which fixed the age at which that honor could be attained. (Spart. in Had. &c.) This edict was subsequently obeyed; for the emperor Valerian, in a letter addressed to Mulvius Gallinnus, prætorian præfect, excuses himself for having violated it in favor of the young Probus afterwards emperor, on whom he had conferred the tribunate at an earlier age on account of his rare talents. (Vopisc. in Prob. iv.)—W. and G. Agricola, though already invested with the title of tribune, was contubernalis in Britain with Suetonius Paulinus. Tac. Agr. v.—M.]