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 delivery of an article, the summons to bear witness, the conclusion of marriage, were complete as soon as the parties had in an intelligible manner declared their purpose; it was usual, indeed, to deliver the article into the hand of the new owner, to pull the person summoned as a witness by the ear, to veil the bride's head and to lead her in solemn procession to her husband's house; but all these primitive practices were already, under the oldest national law of the Romans, customs legally worthless.
In a way entirely analogous to the setting aside of allegory and along with it of personification in religion, every sort of symbolism was on principle expelled from their law. In like manner that earliest state of things presented to us by the Greek as well as the Germanic institutions, wherein the power of the community still contends with the authority of the smaller associations of clans or cantons that are merged in it, is in Roman law wholly superseded; there is no alliance for the vindication of rights within the state, to supplement the state's imperfect aid, by mutual offence and defence; nor is there any serious trace of vengeance for bloodshed, or of the family property restricting the individual's power of disposal.
Such institutions must probably at one time have existed among the Italians; traces of them may perhaps be found in particular institutions of ritual, e. g. in the expiatory goat, which the involuntary homicide was obliged to give to the nearest of kin to the slain; but even at the earliest period of Rome which we can conceive this stage had long been transcended.
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Reference address : https://www.ellopos.net/elpenor/rome/1-11-law-justice.asp?pg=21