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
When a brave officer was about to be led away to a debtor's prison, Manlius interceded for him and released him with his own money; at the same time he offered his lands to sale, declaring loudly that, as long as he possessed a foot's breadth of land, such iniquities should not occur. This was more than enough to unite the whole government party, patricians as well as plebeians, against the dangerous innovator.
The trial for high treason, the charge of having meditated a renewal of the monarchy, wrought on the blind multitude with the insidious charm which belongs to stereotyped party-phrases. They themselves condemned him to death, and his renown availed him nothing save that it was deemed expedient to assemble the people for the bloody assize at a spot whence the voters could not see the rock of the citadel--the dumb monitor which might remind them how their fatherland had been saved from the extremity of danger by the hands of the very man whom they were now consigning to the executioner (370).
While the attempts at reformation were thus arrested in the bud, the social disorders became still more crying; for on the one hand the domain-possessions were ever extending in consequence of successful wars, and on the other hand debt and impoverishment were ever spreading more widely among the farmers, particularly from the effects of the severe war with Veii (348-358) and of the burning of the capital in the Gallic invasion (364).
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=14