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 robe, the ring, and the amulet-case distinguished not only the burgess and the burgess's wife from the foreigner and the slave, but also the person who was free-born from one who had been a slave, the son of free-born, from the son of manumitted, parents, the son of the knight and the senator from the common burgess, the descendant of a curule house from the common senator(49)--and this in a community where all that was good and great was the work of civil equality!
49. Cf. III. XI. Patricio-Plebian Nobility
The dissension in the community was reflected in the ranks of the opposition. Resting on the support of the farmers, the patriots raised a loud cry for reform; resting on the support of the mob in the capital, demagogism began its work. Although the two tendencies do not admit of being wholly separated but in various respects go hand in hand, it will be necessary to consider them apart.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=62