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 judicial matters, first of all, the old regal jurisdiction was re-established. As the king had originally been judge in criminal and civil causes, without being legally bound in the former to respect an appeal to the prerogative of mercy in the people, or in the latter to commit the decision of the question in dispute to jurymen; so Caesar claimed the right of bringing capital causes as well as private processes for sole and final decision to his own bar, and disposing of them in the event of his presence personally, in the event of his absence by the city-lieutenant.
In fact, we find him, quite after the manner of the ancient kings, now sitting in judgment publicly in the Forum of the capital on Roman burgesses accused of high treason, now holding a judicial inquiry, in his house regarding the client princes accused of the like crime; so that the only privilege, which the Roman burgesses had as compared with the other subjects of the king, seems to have consisted in the publicity of the judicial procedure. But this resuscitated supreme jurisdiction of the kings, although Caesar discharged its duties with impartiality and care, could only from the nature of the case find practical application in exceptional cases.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=57