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
If in a clan, which numbered about 80,000 men capable of arms, a single noble could appear at the diet with 10,000 retainers, not reckoning the bondmen and the debtors, it is clear that such an one was more an independent dynast than a burgess of his clan. Moreover, the leading families of the different clans were closely connected and through intermarriages and special treaties formed virtually a compact league, in presence of which the single clan was powerless.
Therefore the communities were no longer able to maintain the public peace, and the law of the strong arm reigned throughout. The dependent found protection only from his master, whom duty and interest compelled to redress the injury inflicted on his client; the state had no longer the power to protect those who were free, and consequently these gave themselves over in numbers to some powerful man as clients.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=29