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
Expulsion of the Tarquins from Rome
It was in this latter way that the monarchy was terminated in Rome. For however much the history of the expulsion of the last Tarquinius, "the proud," may have been interwoven with anecdotes and spun out into a romance, it is not in its leading outlines to be called in question. Tradition credibly enough indicates as the causes of the revolt, that the king neglected to consult the senate and to complete its numbers; that he pronounced sentences of capital punishment and confiscation without advising with his counsellors; that he accumulated immense stores of grain in his granaries, and exacted from the burgesses military labour and task-work beyond what was due.
The exasperation of the people is attested by the formal vow which they made man by man for themselves and for their posterity that thenceforth they would never tolerate a king; by the blind hatred with which the name of king was ever afterwards regarded in Rome; and above all by the enactment that the "king for offering sacrifice" (-rex sacrorum- or -sacrificulus-) --whom they considered it their duty to create that the gods might not miss their accustomed mediator--should be disqualified from holding any further office, so that this man became the foremost indeed, but also the most powerless in the Roman commonwealth.
Along with the last king all the members of his clan were banished--a proof how close at that time gentile ties still were. The Tarquinii thereupon transferred themselves to Caere, perhaps their ancient home,(1) where their family tomb has recently been discovered. In the room of the one president holding office for life two annual rulers were now placed at the head of the Roman community.
1. Cf. I. IX. The Tarquins
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=4