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
Thus the restoration continued to govern with the desires and sentiments of a legitimate aristocracy, and with the constitution and means of government of a -tyrannis-. Its rule not only rested on the same bases as that of Gracchus, but it was equally ill, and in fact still worse, consolidated; it was strong, when in league with the populace it overthrew serviceable institutions, but it was utterly powerless, when it had to face the bands of the streets or the interests of the merchants.
It sat on the vacated throne with an evil conscience and divided hopes, indignant at the institutions of the state which it ruled and yet incapable of even systematically assailing them, vacillating in all its conduct except where its own material advantage prompted a decision, a picture of faithlessness towards its own as well as the opposite party, of inward inconsistency, of the most pitiful impotence, of the meanest selfishness--an unsurpassed ideal of misrule.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=12