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
The Licinian Agrarian Laws
Let us first consider how far any real relief was contained in that part of the legislation of 387 which bore upon the question. That the enactment in favour of the free day-labourers could not possibly accomplish its object--namely, to check the system of farming on a large scale and by means of slaves, and to secure to the free proletarians at least a share of work--is self-evident.
In this matter legislation could afford no relief, without shaking the foundations of the civil organization of the period in a way that would reach far beyond its immediate horizon. In the question of the domains, on the other hand, it was quite possible for legislation to effect a change; but what was done was manifestly inadequate.
The new domain-arrangement, by granting the right of driving very considerable flocks and herds upon the public pastures, and that of occupying domain-land not laid out in pasture up to a maximum fixed on a high scale, conceded to the wealthy an important and perhaps even disproportionate prior share in the produce of the domains; and by the latter regulation conferred upon the domain-tenure, although it remained in law liable to pay a tenth and revocable at pleasure, as well as upon the system of occupation itself, somewhat of a legal sanction.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=27