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
Pompeius Proceeds to Syria
Meanwhile Pompeius, after his warfare in 689 with the peoples of the Caucasus, had returned to the kingdom of Pontus, and there reduced the last castles still offering resistance; these were razed in order to check the evils of brigandage, and the castle wells were rendered unserviceable by rolling blocks of rock into them. Thence he set out in the summer of 690 for Syria, to regulate its affairs.
State of Syria
It is difficult to present a clear view of the state of disorganization which then prevailed in the Syrian provinces. It is true that in consequence of the attacks of Lucullus the Armenian governor Magadates had evacuated these provinces in 685,(7) and that the Ptolemies, gladly as they would have renewed the attempts of their predecessors to attach the Syrian coast to their kingdom, were yet afraid to provoke the Roman government by the occupation of Syria; the more so, as that government had not yet regulated their more than doubtful legal title even in the case of Egypt, and had been several times solicited by the Syrian princes to recognize them as the legitimate heirs of the extinct house of the Lagids.
7. Cf. V. II. All the Armenian Conquests Pass into the Hands of the Romans
But, though the greater powers all at the moment refrained from interference in the affairs of Syria, the land suffered far more than it would have suffered amidst a great war, through the endless and aimless feuds of the princes, knights, and cities.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=30