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
Certainly, whether immediately at that time or soon afterwards, the right of the magistrate entrusted with the preparation of the list to omit from it individual senators on account of a stain attaching to them and thereby to exclude them from the senate was, if not introduced, at least more precisely defined,(22) and in this way the foundations were laid of that peculiar jurisdiction over morals on which the high repute of the censors was chiefly based.(23)
22. This prerogative and the similar ones with reference to the equestrian and burgess-lists were perhaps not formally and legally assigned to the censors, but were always practically implied in their powers. It was the community, not the censor, that conferred burgess-rights; but the person, to whom the latter in making up the list of persons entitled to vote did not assign a place or assigned an inferior one, did not lose his burgess-right, but could not exercise the privileges of a burgess, or could only exercise them in the inferior place, till the preparation of a new list.
The same was the case with the senate; the person omitted by the censor from his list ceased to attend the senate, as long as the list in question remained valid--unless the presiding magistrate should reject it and reinstate the earlier list. Evidently therefore the important question in this respect was not so much what was the legal liberty of the censors, as how far their authority availed with those magistrates who had to summon according to their lists.
Hence it is easy to understand how this prerogative gradually rose in importance, and how with the increasing consolidation of the nobility such erasures assumed virtually the form of judicial decisions and were virtually respected as such. As to the adjustment of the senatorial list undoubtedly the enactment of the Ovinian -plebiscitum- exercised a material share of influence--that the censors should admit to the senate "the best men out of all classes."
23. Cf. II. III. The Burgess-Body. Its Composition
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