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
But the less the kings of Egypt could think of contending in arms against Rome, the more energetically Egyptian gold set itself to resist the Roman plans of union; and in consequence of the peculiar despotico- communistic centralization of the Egyptian finances the revenues of the court of Alexandria were still nearly equal to the public income of Rome even after its augmentation by Pompeius. The suspicious jealousy of the oligarchy, which was chary of allowing any individual either to conquer or to administer Egypt, operated in the same direction.
So the de facto rulers of Egypt and Cyprus were enabled by bribing the leading men in the senate not merely to respite their tottering crowns, but even to fortify them afresh and to purchase from the senate the confirmation of their royal title. But with this they had not yet obtained their object. Formal state-law required a decree of the Roman burgesses; until this was issued, the Ptolemies were dependent on the caprice of every democratic holder of power, and they had thus to commence the warfare of bribery also against the other Roman party, which as the more powerful stipulated for far higher prices.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=70