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 was the beau ideal of bureaucratic centralization; which our counting-house system strives indeed zealously to imitate, but remains as far behind its prototype as the modern power of capital is inferior to the ancient system of slavery. Caesar knew how to profit by this advantage; wherever any post demanded special confidence, we see him filling it up on principle--so far as other considerations at all permit-- with his slaves freedmen, or clients of humble birth.
His works as a whole show what an organizing genius like his could accomplish with such an instrument; but to the question, how in detail these marvellous feats were achieved, we have no adequate answer. Bureaucracy resembles a manufactory also in this respect, that the work done does not appear as that of the individual who has worked at it, but as that of the manufactory which stamps it. This much only is quite clear, that Caesar, in his work had no helper at all who exerted a personal influence over it or was even so much as initiated into the whole plan; he was not only the sole master, but he worked also without skilled associates, merely with common labourers.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=49