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
They were intended, in fine, to procure a share in the common usufructs of burgesses for the poorer commons, alleviation for the suffering debtors, and employment for the day-labourers that were destitute of work. Abolition of privileges, civil equality, social reform--these were the three great ideas, of which it was the design of this movement to secure the recognition.
Vainly the patricians exerted all the means at their command in opposition to these legislative proposals; even the dictatorship and the old military hero Camillus were able only to delay, not to avert their accomplishment. Willingly would the people have separated the proposals; of what moment to it were the consulate and custodiership of oracles, if only the burden of debt were lightened and the public lands were free!
But it was not for nothing that the plebeian nobility had adopted the popular cause; it included the proposals in one single project of law, and after a long struggle--it is said of eleven years--the senate at length gave its consent and they passed in the year 387.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=18