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
But this rigorous retention of barriers against those that were without was accompanied by an absolute banishment of all difference of rights among the members included in the burgess community of Rome. We have already mentioned that the distinctions existing in the household, which of course could not be set aside, were at least ignored in the community; the son who as such was subject in property to his father might thus, in the character of a burgess, come to have command over his father as master.
There were no class-privileges: the fact that the Tities took precedence of the Ramnes, and both ranked before the Luceres, did not affect their equality in all legal rights. The burgess cavalry, which at this period was used for single combat in front of the line on horseback or even on foot, and was rather a select or reserve corps than a special arm of the service, and which accordingly contained by far the wealthiest, best-armed, and best-trained men, was naturally held in higher estimation than the burgess infantry; but this was a distinction purely -de facto-, and admittance to the cavalry was doubtless conceded to any patrician.
It was simply and solely the constitutional subdivision of the burgess-body that gave rise to distinctions recognized by the law; otherwise the legal equality of all the members of the community was carried out even in their external appearance. Dress indeed served to distinguish the president of the community from its members, the grown-up man under obligation of military service from the boy not yet capable of enrolment; but otherwise the rich and the noble as well as the poor and low-born were only allowed to appear in public in the like simple wrapper (-toga-) of white woollen stuff.
This complete equality of rights among the burgesses had beyond doubt its original basis in the Indo-Germanic type of constitution; but in the precision with which it was thus apprehended and embodied it formed one of the most characteristic and influential peculiarities of the Latin nation. And in connection with this we may recall the fact that in Italy we do not meet with any race of earlier settlers less capable of culture, that had become subject to the Latin immigrants.(8) They had no conquered race to deal with, and therefore no such condition of things as that which gave rise to the Indian system of caste, to the nobility of Thessaly and Sparta and perhaps of Greece generally, and probably also to the Germanic distinction of ranks.
8. Cf. I. II. Primitive Races of Italy
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/1-05-original-constitution-rome.asp?pg=18