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 relation in this case approximated to the lease of subsequent times, but remained always distinguished from it partly by the absence of a fixed term for its expiry, partly by its non-actionable character on either side and the legal protection of the claim for rent depending entirely on the lessor's right of ejection. It is plain that it was essentially a relation based on mutual fidelity, which could not subsist without the help of the powerful sanction of custom consecrated by religion; and this was not wanting.
The institution of clientship, altogether of a moral-religious nature, beyond doubt rested fundamentally on this assignation of the profits of the soil. Nor was the introduction of such an assignation dependent on the abolition of the system of common tillage; for, just as after this abolition the individual, so previous to it the clan might grant to dependents a joint use of its lands; and beyond doubt with this very state of things was connected the fact that the Roman clientship was not personal, but that from the outset the client along with his clan entrusted himself for protection and fealty to the patron and his clan.
This earliest form of Roman landholding serves to explain how there sprang from the great landlords in Rome a landed, and not an urban, nobility. As the pernicious institution of middlemen remained foreign to the Romans, the Roman landlord found himself not much less chained to his land than was the tenant and the farmer; he inspected and took part in everything himself, and the wealthy Roman esteemed it his highest praise to be reckoned a good landlord.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=14