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
Character of the Roman Law
We have derived our outline of these institutions mainly from the earliest record of the Roman common law prepared about half a century after the abolition of the monarchy; and their existence in the regal period, while doubtful perhaps as to particular points of detail, cannot be doubted in the main. Surveying them as a whole, we recognize the law of a far-advanced agricultural and mercantile city, marked alike by its liberality and its consistency.
In its case the conventional language of symbols, such as e. g. the Germanic laws exhibit, has already quite disappeared. There is no doubt that such a symbolic language must have existed at one time among the Italians. Remarkable instances of it are to be found in the form of searching a house, wherein the searcher must, according to the Roman as well as the Germanic custom, appear without upper garment merely in his shirt; and especially in the primitive Latin formula for declaring war, in which we meet with two symbols occurring at least also among the Celts and the Germans--the "pure herb" (-herba pura-, Franconian -chrene chruda-) as a symbol of the native soil, and the singed bloody staff as a sign of commencing war.
But with a few exceptions, in which reasons of religion protected the ancient usages--to which class the -confarreatio- as well as the declaration of war by the college of Fetiales belonged--the Roman law, as we know it, uniformly and on principle rejects the symbol, and requires in all cases neither more nor less than the full and pure expression of will.
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Reference address : http://www.ellopos.net/elpenor/rome/1-11-law-justice.asp?pg=20