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
Change in the Nomination of Priests
The nomination of the priests, which had been a prerogative of the kings,(8) was not transferred to the consuls; but the colleges of priests filled up the vacancies in their own ranks, while the Vestals and single priests were nominated by the pontifical college, on which devolved also the exercise of the paternal jurisdiction, so to speak, of the community over the priestesses of Vesta.
8. Cf. I. V. The King
With a view to the performance of these acts, which could only be properly performed by a single individual, the college probably about this period first nominated a president, the -Pontifex maximus-. This separation of the supreme authority in things sacred from the civil power--while the already-mentioned "king for sacrifice" had neither the civil nor the sacred powers of the king, but simply the title, conferred upon him --and the semi-magisterial position of the new high priest, so decidedly contrasting with the character which otherwise marked the priesthood in Rome, form one of the most significant and important peculiarities of this state-revolution, the aim of which was to impose limits on the powers of the magistrates mainly in the interest of the aristocracy.
We have already mentioned that the outward state of the consul was far inferior to that of the regal office hedged round as it was with reverence and terror, that the regal name and the priestly consecration were withheld from him, and that the axe was taken away from his attendants. We have to add that, instead of the purple robe which the king had worn, the consul was distinguished from the ordinary burgess simply by the purple border of his toga, and that, while the king perhaps regularly appeared in public in his chariot, the consul was bound to accommodate himself to the general rule and like every other burgess to go within the city on foot.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=16