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
Discussions in the Senate as to the Execution of Those Arrested
In a tolerably well-ordered commonwealth the matter would now have been politically at an end, and the military and the tribunals would have undertaken the rest. But in Rome matters had come to such a pitch, that the government was not even in a position to keep a couple of noblemen of note in safe custody. The slaves and freedmen of Lentulus and of the others arrested were stirring; plans, it was alleged, were contrived to liberate them by force from the private houses in which they were detained; there was no lack-- thanks to the anarchist doings of recent years--of ringleaders in Rome who contracted at a certain rate for riots and deeds of violence; Catilina, in fine, was informed of what had occurred, and was near enough to attempt a coup de main with his bands.
How much of these rumours was true, we cannot tell; but there was ground for apprehension, because, agreeably to the constitution, neither troops nor even a respectable police force were at the command of the government in the capital, and it was in reality left at the mercy of every gang of banditti. The idea was suggested of precluding all possible attempts at liberation by the immediate execution of the prisoners. Constitutionally, this was not possible. According to the ancient and sacred right of appeal, a sentence of death could only be pronounced against the Roman burgess by the whole body of burgesses, and not by any other authority; and, as the courts formed by the body of burgesses had themselves become antiquated, a capital sentence was no longer pronounced at all.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=37