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 Hill-Romans on the Quirinal
But the Palatine city was not the only one that in ancient times existed within the circle afterwards enclosed by the Servian walls; opposite to it, in its immediate vicinity, there lay a second city on the Quirinal. The "old stronghold" (-Capitolium vetus-) with a sanctuary of Jupiter, Juno, and Minerva, and a temple of the goddess of Fidelity in which state treaties were publicly deposited, forms the evident counterpart of the later Capitol with its temple to Jupiter, Juno, and Minerva, and with its shrine of Fides Romana likewise destined as it were for a repository of international law, and furnishes a sure proof that the Quirinal also was once the centre of an independent commonwealth.
The same fact may be inferred from the double worship of Mars on the Palatine and the Quirinal; for Mars was the type of the warrior and the oldest chief divinity of the burgess communities of Italy. With this is connected the further circumstance that his ministers, the two primitive colleges of the "Leapers" (-Salii-) and of the "Wolves" (-Luperci-) existed in the later Rome in duplicate: by the side of the Salii of the Palatine there were also Salii of the Quirinal; by the side of the Quinctian Luperci of the Palatine there was a Fabian guild of Luperci, which in all probability had their sanctuary on the Quirinal.(5)
5. That the Quinctian Luperci had precedence in rank over the Fabian is evident from the circumstance that the fabulists attribute the Quinctii to Romulus, the Fabii to Remus (Ovid, Fast. ii. 373 seq.; Vict. De Orig. 22). That the Fabii belonged to the Hill-Romans is shown by the sacrifice of their -gens- on the Quirinal (Liv. v. 46, 52), whether that sacrifice may or may not have been connected with the Lupercalia.
Moreover, the Lupercus of the former college is called in inscriptions (Orelli, 2253) -Lupercus Quinctialis vetus-; and the -praenomen-Kaeso, which was most probably connected with the Lupercal worship (see Rom. Forschungen, i. 17), is found exclusively among the Quinctii and Fabii: the form commonly occurring in authors, -Lupercus Quinctilius- and -Quinctilianus-, is therefore a misnomer, and the college belonged not to the comparatively recent Quinctilii, but to the far older Quinctii. When, again, the Quinctii (Liv. i. 30), or Quinctilii (Dion. iii. 29), are named among the Alban clans, the latter reading is here to be preferred, and the Quinctii are to be regarded rather as an old Roman -gens-.
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Reference address : https://www.ellopos.net/elpenor/rome/1-04-beginnings-rome.asp?pg=15