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 Magistrates. Partition and Weakening of the Consular Powers
As regards the power of the magistrates, its diminution, although not the direct design of the struggles between the old and new burgesses, was doubtless one of their most important results. At the beginning of the struggle between the orders or, in other words, of the strife for the possession of the consular power, the consulate was still the one and indivisible, essentially regal, magistracy; and the consul, like the king in former times, still had the appointment of all subordinate functionaries left to his own free choice.
At the termination of that contest its most important functions --jurisdiction, street-police, election of senators and equites, the census and financial administration --were separated from the consulship and transferred to magistrates, who like the consul were nominated by the community and occupied a position far more co-ordinate than subordinate. The consulate, formerly the single ordinary magistracy of the state, was now no longer even absolutely the first.
In the new arrangement as to the ranking and usual order of succession of the public offices the consulate stood indeed above the praetorship, aedileship, and quaestorship, but beneath the censorship, which--in addition to the most important financial duties --was charged with the adjustment of the rolls of burgesses, equites, and senators, and thereby wielded a wholly arbitrary moral control over the entire community and every individual burgess, the humblest as well as the most prominent.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=45