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
Such a society of pirates was a political power; and as a political power it gave itself out and was accepted from the time when the Syrian king Tryphon first employed it as such and rested his throne on its support.(4)
4. Cf. IV. I. Cilicia
We find the pirates as allies of king Mithradates of Pontus as well as of the Roman democratic emigrants; we find them giving battle to the fleets of Sulla in the eastern and in the western waters; we find individual pirate princes ruling over a series of considerable coast towns. We cannot tell how far the internal political development of this floating state had already advanced; but its arrangements undeniably contained the germ of a sea-kingdom, which was already beginning to establish itself, and out of which, under favourable circumstances, a permanent state might have been developed.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=10