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 fencing and in riding he was a match for any of his soldiers, and his swimming saved his life at Alexandria; the incredible rapidity of his journeys, which usually for the sake of gaining time were performed by night--a thorough contrast to the procession-like slowness with which Pompeius moved from one place to another-- was the astonishment of his contemporaries and not the least among the causes of his success. The mind was like the body. His remarkable power of intuition revealed itself in the precision and practicability of all his arrangements, even where he gave orders without having seen with his own eyes. His memory was matchless, and it was easy for him to carry on several occupations simultaneously with equal self-possession.
Although a gentleman, a man of genius, and a monarch, he had still a heart. So long as he lived, he cherished the purest veneration for his worthy mother Aurelia (his father having died early); to his wives and above all to his daughter Julia he devoted an honourable affection, which was not without reflex influence even on political affairs. With the ablest and most excellent men of his time, of high and of humbler rank, he maintained noble relations of mutual fidelity, with each after his kind. As he himself never abandoned any of his partisans after the pusillanimous and unfeeling manner of Pompeius, but adhered to his friends--and that not merely from calculation--through good and bad times without wavering, several of these, such as Aulus Hirtius and Gaius Matius, gave, even after his death, noble testimonies of their attachment to him.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=2