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
Combination of the Plebian Aristocracy and the Farmers against the Nobility - Licinio-Sextian Laws
Under such circumstances, when the plebeian aristocracy saw itself practically excluded by the opposition of the nobility and the indifference of the commons from equality of political rights, and the suffering farmers were powerless as opposed to the close aristocracy, it was natural that they should help each other by a compromise.
With this view the tribunes of the people, Gaius Licinius and Lucius Sextius, submitted to the commons proposals to the following effect: first, to abolish the consular tribunate; secondly, to lay it down as a rule that at least one of the consuls should be a plebeian; thirdly, to open up to the plebeians admission to one of the three great colleges of priests--that of the custodiers of oracles, whose number was to be increased to ten (-duoviri-, afterwards -decemviri sacris faciundis-(6)); fourthly, as respected the domains, to allow no burgess to maintain upon the common pasture more than a hundred oxen and five hundred sheep, or to hold more than five hundred -jugera- (about 300 acres) of the domain lands left free for occupation; fifthly, to oblige the landlords to employ in the labours of the field a number of free labourers proportioned to that of their rural slaves; and lastly, to procure alleviation for debtors by deduction of the interest which had been paid from the capital, and by the arrangement of set terms for the payment of arrears.
6. Cf. I. XII. Foreign Worships
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=16