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
Besides as a tenant he had in fact, though not in law, land and cattle, wife and child, as the landlord had, and after manumission was introduced(14) there was a possibility, not remote, of working out his freedom.
14. Cf. I. XI. Guardianship
If such then was the footing on which landholding on a large scale stood in the earliest times, it was far from being an open sore in the commonwealth; on the contrary, it was of most material service to it.
Not only did it provide subsistence, although scantier upon the whole, for as many families in proportion as the intermediate and smaller properties; but the landlords moreover, occupying a comparatively elevated and free position, supplied the community with its natural leaders and rulers, while the agricultural and unpropertied tenants-on-sufferance furnished the genuine material for the Roman policy of colonization, without which it never would have succeeded; for while the state may furnish land to him who has none, it cannot impart to one who knows nothing of agriculture the spirit and the energy to wield the plough.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=16