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
He, it may be presumed, took the first steps towards filling up the five hundred years, which were wanting to bring the destruction of Troy and the origin of Rome into the chronological connection required by the fables on either side, with one of those lists of kings without achievements which are unhappily familiar to the Egyptian and Greek chroniclers; for, to all appearance, it was he that launched into the world the kings Aventinus and Tiberinus and the Alban gens of the Silvii, whom the following times accordingly did not neglect to furnish in detail with name, period of reigning, and, for the sake of greater definiteness, also a portrait.
Thus from various sides the historical romance of the Greeks finds its way into Roman historiography; and it is more than probable that not the least portion of what we are accustomed nowadays to call tradition of the Roman primitive times proceeds from sources of the stamp of Amadis of Gaul and the chivalrous romances of Fouque--an edifying consideration, at least for those who have a relish for the humour of history and who know how to appreciate the comical aspect of the piety still cherished in certain circles of the nineteenth century for king Numa.
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Reference address : https://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=72