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 Family and the State
All that may be called the patriarchal element in the state rested in Greece and Italy on the same foundations. Under this head comes especially the moral and decorous arrangement of social life, (9) which enjoined monogamy on the husband and visited with heavy penalties the infidelity of the wife, and which recognized the equality of the sexes and the sanctity of marriage in the high position which it assigned to the mother within the domestic circle. On the other hand the rigorous development of the marital and still more of the paternal authority, regardless of the natural rights of persons as such, was a feature foreign to the Greeks and peculiarly Italian; it was in Italy alone that moral subjection became transformed into legal slavery. In the same way the principle of the slave being completely destitute of legal rights--a principle involved in the very nature of slavery--was maintained by the Romans with merciless rigour and carried out to all its consequences; whereas among the Greeks alleviations of its harshness were early introduced both in practice and in legislation, the marriage of slaves, for example, being recognized as a legal relation.
9. Even in details this agreement appears; e.g., in the designation of lawful wedlock as "marriage concluded for the obtaining of lawful children" (--gauos epi paidon gneision aroto--, -matrimonium liberorum quaerendorum causa-).
On the household was based the clan, that is, the community of the descendants of the same progenitor; and out of the clan among the Greeks as well as the Italians arose the state. But while under the weaker political development of Greece the clan-bond maintained itself as a corporate power in contradistinction to that of the state far even into historical times, the state in Italy made its appearance at once complete, in so far as in presence of its authority the clans were quite neutralized and it exhibited an association not of clans, but of citizens. Conversely, again, the individual attained, in presence of the clan, an inward independence and freedom of personal development far earlier and more completely in Greece than in Rome--a fact reflected with great clearness in the Greek and Roman proper names, which, originally similar, came to assume very different forms.
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Reference address : https://www.ellopos.net/elpenor/rome/1-02-earliest-migrations-italy.asp?pg=22