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
The Seven Mounts
The "festival of the Seven Mounts" (-septimontium-), again, has preserved the memory of the more extended settlement which gradually formed round the Palatine. Suburbs grew up one after another, each protected by its own separate though weaker circumvallation and joined to the original ring-wall of the Palatine, as in fen districts the outer dikes are joined on to the main dike. The "Seven Rings" were, the Palatine itself; the Cermalus, the slope of the Palatine in the direction of the morass that extended between it and the Capitol towards the river (-velabrum-); the Velia, the ridge which connected the Palatine with the Esquiline, but in subsequent times was almost wholly obliterated by the buildings of the empire; the Fagutal, the Oppius, and the Cispius, the three summits of the Esquiline; lastly, the Sucusa, or Subura, a fortress constructed outside of the earthen rampart which protected the new town on the Carinae, in the depression between the Esquiline and the Quirinal beneath S. Pietro in Vincoli. These additions, manifestly the results of a gradual growth, clearly reveal to a certain extent the earliest history of the Palatine Rome, especially when we compare with them the Servian arrangement of districts which was afterwards formed on the basis of this earliest division.
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Reference address : https://www.ellopos.net/elpenor/rome/1-04-beginnings-rome.asp?pg=11