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 chief result of such a view (as we may here mention by way of anticipation) may be summed up in saying that fewer traces comparatively of the primitive state of things have been preserved in the case of the Italians, and of the Romans in particular, than in the case of any other Indo-Germanic race.
The bow and arrow, the war-chariot, the incapacity of women to hold property, the acquiring of wives by purchase, the primitive form of burial, blood-revenge, the clan-constitution conflicting with the authority of the community, a vivid natural symbolism --all these, and numerous phenomena of a kindred character, must be presumed to have lain at the foundation of civilization in Italy as well as elsewhere; but at the epoch when that civilization comes clearly into view they have already wholly disappeared, and only the comparison of kindred races informs us that such things once existed. In this respect Italian history begins at a far later stage of civilization than e.g. the Greek or the Germanic, and from the first it exhibits a comparatively modern character.
The laws of most of the Italian stocks are lost in oblivion. Some information regarding the law of the Latin land alone has survived in Roman tradition.
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Reference address : https://www.ellopos.net/elpenor/rome/1-11-law-justice.asp?pg=2