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
What in Caesar passes for such at the first superficial glance is, when more closely observed, seen to be the peculiarity not of the individual, but of the epoch of culture or of the nation; his youthful adventures, for instance, were common to him with all his more gifted contemporaries of like position, his unpoetical but strongly logical temperament was the temperament of Romans in general. It formed part also of Caesar's full humanity that he was in the highest degree influenced by the conditions of time and place; for there is no abstract humanity-- the living man cannot but occupy a place in a given nationality and in a definite line of culture. Caesar was a perfect man just because he more than any other placed himself amidst the currents of his time, and because he more than any other possessed the essential peculiarity of the Roman nation--practical aptitude as a citizen--in perfection: for his Hellenism in fact was only the Hellenism which had been long intimately blended with the Italian nationality.
But in this very circumstance lies the difficulty, we may perhaps say the impossibility, of depicting Caesar to the life. As the artist can paint everything save only consummate beauty, so the historian, when once in a thousand years he encounters the perfect, can only be silent regarding it. For normality admits doubtless of being expressed, but it gives us only the negative notion of the absence of defect; the secret of nature, whereby in her most finished manifestations normality and individuality are combined, is beyond expression. Nothing is left for us but to deem those fortunate who beheld this perfection, and to gain some faint conception of it from the reflected lustre which rests imperishably on the works that were the creation of this great nature. These also, it is true, bear the stamp of the time. The Roman hero himself stood by the side of his youthful Greek predecessor not merely as an equal, but as a superior; but the world had meanwhile become old and its youthful lustre had faded.
The action of Caesar was no longer, like that of Alexander, a joyous marching onward towards a goal indefinitely remote; he built on, and out of, ruins, and was content to establish himself as tolerably and as securely as possible within the ample but yet definite bounds once assigned to him. With reason therefore the delicate poetic tact of the nations has not troubled itself about the unpoetical Roman, and on the other hand has invested the son of Philip with all the golden lustre of poetry, with all the rainbow hues of legend. But with equal reason the political life of the nations has during thousands of years again and again reverted to the lines which Caesar drew; and the fact, that the peoples to whom the world belongs still at the present day designate the highest of their monarchs by his name, conveys a warning deeply significant and, unhappily, fraught with shame.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=13