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
It is, therefore, quite easy to understand how the assemblies of the burgesses, which had great practical importance during the first two centuries of the republic, gradually became a mere instrument in the hands of the presiding magistrate, and in truth a very dangerous instrument, because the magistrates called to preside were so numerous, and every resolution of the community was regarded as the ultimate legal expression of the will of the people. But the enlargement of the constitutional rights of the burgesses was not of much moment, inasmuch as these were less than formerly capable of a will and action of their own, and there was as yet no demagogism, in the proper sense of that term, in Rome.
Had any such demagogic spirit existed, it would have attempted not to extend the powers of the burgesses, but to remove the restrictions on political debate in their presence; whereas throughout this whole period there was undeviating acquiescence in the old maxims, that the magistrate alone could convoke the burgesses, and that he was entitled to exclude all debate and all proposal of amendments. At the time this incipient breaking up of the constitution made itself felt chiefly in the circumstance that the primary assemblies assumed an essentially passive attitude, and did not on the whole interfere in government either to help or to hinder it.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=44