Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Encroachments on That Equality of Rights - As to Wars and Treaties - As to the Officering of the Army - As to Acquisitions in War
These stipulations must probably even in the regal period, certainly in the republican epoch, have undergone alteration more and more to the disadvantage of the confederacy and to the further development of the hegemony of Rome. The earliest that fell into abeyance was beyond doubt the right of the confederacy to make wars and treaties with foreigners;(3) the decision of war and treaty passed once for all to Rome.
3. Dionysius (viii. 15) expressly states, that in the later federal treaties between Rome and Latium the Latin communities were interdicted from calling out their contingents of their own motion and sending them into the field alone.
The staff officers for the Latin troops must doubtless in earlier times have been likewise Latins; afterwards for that purpose Roman citizens were taken, if not exclusively, at any rate predominantly.(4)
4. These Latin staff-officers were the twelve -praefecti sociorum-, who subsequently, when the old phalanx had been resolved into the later legions and -alae-, had the charge of the two -alae- of the federal contingents, six to each -ala-, just as the twelve war-tribunes of the Roman army had charge of the two legions, six to each legion. Polybius (vi. 26, 5) states that the consul nominated the former, as he originally nominated the latter. Now, as according to the ancient maxim of law, that every person under obligation of service might become an officer (p. 106), it was legally allowable for the general to appoint a Latin as leader of a Roman, as well as conversely a Roman as leader of a Latin, legion, this led to the practical result that the -tribuni militum- were wholly, and the -praefecti sociorum- at least ordinarily, Romans.
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