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
Mars and Jupiter
The central object not only of Roman but of Italian worship generally in that epoch when the Italian stock still dwelt by itself in the peninsula was, according to all indications, the god Maurs or Mars, the killing god,(3) preeminently regarded as the divine champion of the burgesses, hurling the spear, protecting the flock, and overthrowing the foe. Each community of course possessed its own Mars, and deemed him to be the strongest and holiest of all; and accordingly every "-ver sacrum-" setting out to found a new community marched under the protection of its own Mars.
3. From -Maurs-, which is the oldest form handed down by tradition, there have been developed by different treatment of the -u -Mars-, -Mavors-, -Mors-; the transition to -o (similar to -Paula-, -Pola-, and the like) appears also in the double form Mar-Mor (comp. -Ma-murius-) alongside of -Mar-Mor- and -Ma-Mers-.
To Mars was dedicated the first month not only in the Roman calendar of the months, which in no other instance takes notice of the gods, but also probably in all the other Latin and Sabellian calendars: among the Roman proper names, which in like manner contain no allusion to any gods, Marcus, Mamercus, and Mamurius appear in prevailing use from very early times; with Mars and his sacred woodpecker was connected the oldest Italian prophecy; the wolf, the animal sacred to Mars, was the badge of the Roman burgesses, and such sacred national legends as the Roman imagination was able to produce referred exclusively to the god Mars and to his duplicate Quirinus.
In the list of festivals certainly Father Diovis--a purer and more civil than military reflection of the character of the Roman community--occupies a larger space than Mars, just as the priest of Jupiter has precedence over the two priests of the god of war; but the latter still plays a very prominent part in the list, and it is even quite likely that, when this arrangement of festivals was established, Jovis stood by the side of Mars like Ahuramazda by the side of Mithra, and that the worship of the warlike Roman community still really centred at this time in the martial god of death and his March festival, while it was not the "care-destroyer" afterwards introduced by the Greeks, but Father Jovis himself, who was regarded as the god of the heart-gladdening wine.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=6