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 conception of limited magisterial power or special function, which seemed to the original Roman state-law irreconcilable with the conception of supreme office, gradually gained a footing and mutilated and destroyed the earlier idea of the one and indivisible -imperium-. A first step was already taken in this direction by the institution of the standing collateral offices, particularly the quaestorship;(14) it was completely carried out by the Licinian laws (387), which prescribed the functions of the three supreme magistrates, and assigned administration and the conduct of war to the two first, and the management of justice to the third.
14. Cf. II. I. Restrictions on the Delegation of Powers
But the change did not stop here. The consuls, although they were in law wholly and everywhere co-ordinate, naturally from the earliest times divided between them in practice the different departments of duty (-provinciae-). Originally this was done simply by mutual concert, or in default of it by casting lots; but by degrees the other constituent authorities in the commonwealth interfered with this practical definition of functions.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=46