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
Increasing Powers of the Burgesses
The powers of the comitia exhibited during this period a tendency to enlarge their range, but in a manner very gradual. The increase in the number of magistrates to be elected by the people falls, to some extent, under this head; it is an especially significant fact that from 392 the military tribunes of one legion, and from 443 four tribunes in each of the first four legions respectively, were nominated no longer by the general, but by the burgesses.
During this period the burgesses did not on the whole interfere in administration; only their right of declaring war was, as was reasonable, emphatically maintained, and held to extend also to cases in which a prolonged armistice concluded instead of a peace expired and what was not in law but in fact a new war began (327).
In other instances a question of administration was hardly submitted to the people except when the governing authorities fell into collision and one of them referred the matter to the people--as when the leaders of the moderate party among the nobility, Lucius Valerius and Marcus Horatius, in 305, and the first plebeian dictator, Gaius Marcius Rutilus, in 398, were not allowed by the senate to receive the triumphs they had earned; when the consuls of 459 could not agree as to their respective provinces of jurisdiction; and when the senate, in 364, resolved to give up to the Gauls an ambassador who had forgotten his duty, and a consular tribune carried the matter to the community.
This was the first occasion on which a decree of the senate was annulled by the people; and heavily the community atoned for it. Sometimes in difficult cases the government left the decision to the people, as first, when Caere sued for peace, after the people had declared war against it but before war had actually begun (401); and at a subsequent period, when the senate hesitated to reject unceremoniously the humble entreaty of the Samnites for peace (436).
It is not till towards the close of this epoch that we find a considerably extended intervention of the -comitia tributa- in affairs of administration, particularly through the practice of consulting it as to the conclusion of peace and of alliances: this extension probably dates from the Hortensian law of 467.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=42