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
Agriculture and the Art of War
Agriculture and the art of war were, of course, primarily regulated by the standard of traditional and personal experience, as is very distinctly apparent in that one of the two treatises of Cato on Agriculture which has reached our time. But the results of Graeco- Latin, and even of Phoenician, culture were brought to bear on these subordinate fields just as on the higher provinces of intellectual activity, and for that reason the foreign literature relating to them cannot but have attracted some measure of attention.
Jurisprudence, on the other hand, was only in a subordinate degree affected by foreign elements. The activity of the jurists of this period was still mainly devoted to the answering of parties consulting them and to the instruction of younger listeners; but this oral instruction contributed to form a traditional groundwork of rules, and literary activity was not wholly wanting. A work of greater importance for jurisprudence than the short sketch of Cato was the treatise published by Sextus Aelius Paetus, surnamed the "subtle" (-catus-), who was the first practical jurist of his time, and, in consequence of his exertions for the public benefit in this respect, rose to the consulship (556) and to the censorship (560).
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Reference address : https://www.ellopos.net/elpenor/rome/3-14-literature-art.asp?pg=105