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
No restriction was imposed by law on the free divisibility of property. Desirable as it might be that co-heirs should remain in the undivided possession of their heritage, even the oldest law was careful to keep the power of dissolving such a partnership open at any time to any partner; it was good that brethren should dwell together in peace, but to compel them to do so was foreign to the liberal spirit of Roman law. The Servian constitution moreover shows that even in the regal period of Rome there were not wanting cottagers and garden-proprietors, with whom the mattock took the place of the plough.
It was left to custom and the sound sense of the population to prevent excessive subdivision of the soil; and that their confidence in this respect was not misplaced and the landed estates ordinarily remained entire, is proved by the universal Roman custom of designating them by permanent individual names. The community exercised only an indirect influence in the matter by the sending forth of colonies, which regularly led to the establishment of a number of new full hides, and frequently doubtless also to the suppression of a number of cottage holdings, the small landholders being sent forth as colonists.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=12