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
It can hardly, moreover, be doubted that the last regal family which ruled over Rome, that of the Tarquins, was of Etruscan origin, whether it belonged to Tarquinii, as the legend asserts, or to Caere, where the family tomb of the Tarchnas has recently been discovered. The female name Tanaquil or Tanchvil interwoven with the legend, while it is not Latin, is common in Etruria. But the traditional story--according to which Tarquin was the son of a Greek who had migrated from Corinth to Tarquinii, and came to settle in Rome as a μέτοικος is neither history nor legend, and the historical chain of events is manifestly in this instance not confused merely, but completely torn asunder.
If anything more can be deduced from this tradition beyond the bare and at bottom indifferent fact that at last a family of Tuscan descent swayed the regal sceptre in Rome, it can only be held as implying that this dominion of a man of Tuscan origin ought not to be viewed either as a dominion of the Tuscans or of any one Tuscan community over Rome, or conversely as the dominion of Rome over southern Etruria. There is, in fact, no sufficient ground either for the one hypothesis or for the other. The history of the Tarquins had its arena in Latium, not in Etruria; and Etruria, so far as we can see, during the whole regal period exercised no influence of any essential moment on either the language or customs of Rome, and did not at all interrupt the regular development of the Roman state or of the Latin league.
The cause of this comparatively passive attitude of Etruria towards the neighbouring land of Latium is probably to be sought partly in the struggles of the Etruscans with the Celts on the Po, which presumably the Celts did not cross until after the expulsion of the kings from Rome, and partly in the tendency of the Etruscan people towards seafaring and the acquisition of supremacy on the sea and seaboard--a tendency decidedly exhibited in their settlements in Campania, and of which we shall speak more fully in the next chapter.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/1-09-etruscans.asp?pg=13