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
In attempting to give a detailed account of the mode in which the transition was effected from the old to the new state of things, we must first of all recollect that Caesar came not to begin, but to complete. The plan of a new polity suited to the times, long ago projected by Gaius Gracchus, had been maintained by his adherents and successors with more or less of spirit and success, but without wavering. Caesar, from the outset and as it were by hereditary right the head of the popular party, had for thirty years borne aloft its banner without ever changing or even so much as concealing his colours; he remained democrat even when monarch.
As he accepted without limitation, apart of course from the preposterous projects of Catilina and Clodius, the heritage of his party; as he displayed the bitterest, even personal, hatred to the aristocracy and the genuine aristocrats; and as he retained unchanged the essential ideas of Roman democracy, viz. alleviation of the burdens of debtors, transmarine colonization, gradual equalization of the differences of rights among the classes belonging to the state, emancipation of the executive power from the senate: his monarchy was so little at variance with democracy, that democracy on the contrary only attained its completion and fulfilment by means of that monarchy. For this monarchy was not the Oriental despotism of divine right, but a monarchy such as Gaius Gracchus wished to found, such as Pericles and Cromwell founded-- the representation of the nation by the man in whom it puts supreme and unlimited confidence.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=26