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
The Last Seleucids
There was no want, however, of a legitimate king in Syria; there were even two or three of them. A prince Antiochus from the house of the Seleucids had been appointed by Lucullus as ruler of the most northerly province in Syria, Commagene.(13)
13. Cf. V. II. All the Armenian Conquests Pass into the Hands of the Romans
Antiochus Asiaticus, whose claims on the Syrian throne had met with recognition both from the senate and from Lucullus,(14) had been received in Antioch after the retreat of the Armenians and there acknowledged as king.
14. Cf. V. II. Beginning of the Armenian War, V. II. All the Armenian Conquests Pass into the Hands of the Romans
A third Seleucid prince Philippus had immediately confronted him there as a rival; and the great population of Antioch, excitable and delighting in opposition almost like that of Alexandria, as well as one or two of the neighbouring Arab emirs had interfered in the family strife which now seemed inseparable from the rule of the Seleucids. Was there any wonder that legitimacy became ridiculous and loathsome to its subjects, and that the so-called rightful kings were of even somewhat less importance in the land than the petty princes and robber-chiefs?
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=38