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
It became usual for the senate to define annually the spheres of duty; and, while it did not directly distribute them among the co-ordinate magistrates, it exercised decided influence on the personal distribution by advice and request. In an extreme case the senate doubtless obtained a decree of the community, definitively to settle the question of distribution;(15) the government, however, very seldom employed this dangerous expedient.
15. Cf. II. III. Increasing Powers of the Burgesses
Further, the most important affairs, such as the concluding of peace, were withdrawn from the consuls, and they were in such matters obliged to have recourse to the senate and to act according to its instructions. Lastly, in cases of extremity the senate could at any time suspend the consuls from office; for, according to an usage never established by law but never violated in practice, the creation of a dictatorship depended simply upon the resolution of the senate, and the fixing of the person to be nominated, although constitutionally vested in the nominating consul, really under ordinary circumstances lay with the senate.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=47