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 only heightens the deep and tragic significance of his death that he was himself a fool; in truth it is just because Don Quixote is a fool that he is a tragic figure. It is an affecting fact, that on that world-stage, on which so many great and wise men had moved and acted, the fool was destined to give the epilogue. He too died not in vain. It was a fearfully striking protest of the republic against the monarchy, that the last republican went as the first monarch came--a protest which tore asunder like gossamer all that so-called constitutional character with which Caesar invested his monarchy, and exposed in all its hypocritical falsehood the shibboleth of the reconciliation of all parties, under the aegis of which despotism grew up.
The unrelenting warfare which the ghost of the legitimate republic waged for centuries, from Cassius and Brutus down to Thrasea and Tacitus, nay, even far later, against the Caesarian monarchy--a warfare of plots and of literature-- was the legacy which the dying Cato bequeathed to his enemies. This republican opposition derived from Cato its whole attitude-- stately, transcendental in its rhetoric, pretentiously rigid, hopeless, and faithful to death; and accordingly it began even immediately after his death to revere as a saint the man who in his lifetime was not unfrequently its laughing-stock and its scandal. But the greatest of these marks of respect was the involuntary homage which Caesar rendered to him, when he made an exception to the contemptuous clemency with which he was wont to treat his opponents, Pompeians as well as republicans, in the case of Cato alone, and pursued him even beyond the grave with that energetic hatred which practical statesmen are wont to feel towards antagonists opposing them from a region of ideas which they regard as equally dangerous and impracticable.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=137