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 actual masters in the Seleucid kingdom were at this time the Bedouins, the Jews, and the Nabataeans. The inhospitable sandy steppe destitute of springs and trees, which, stretching from the Arabianpeninsula up to and beyond the Euphrates, reaches towards the west as far as the Syrian mountain-chain and its narrow belt of coast, toward the east as far as the rich lowlands of the Tigris and lower Euphrates--this Asiatic Sahara--was the primitive home of the sons of Ishmael; from the commencement of tradition we find the "Bedawi," the "son of the desert," pitching his tents there and pasturing his camels, or mounting his swift horse in pursuit now of the foe of his tribe, now of the travelling merchant. Favoured formerly by king Tigranes, who made use of them for his plans half commercial half political,(8) and subsequently by the total absence of any master in the Syrian land, these children of the desert spread themselves over northern Syria.
8. Cf. V. II. Syria under Tigranes
Wellnigh the leading part in a political point of view was enacted by those tribes, which had appropriated the first rudiments of a settled existence from the vicinity of the civilized Syrians. The most noted of these emirs were Abgarus, chief of the Arab tribe of the Mardani, whom Tigranes had settled about Edessa and Carrhae in upper Mesopotamia;(9) then to the west of the Euphrates Sampsiceramus, emir of the Arabs of Hemesa (Homs) between Damascus and Antioch, and master of the strong fortress Arethusa; Azizus the head of another horde roaming in the same region; Alchaudonius, the prince of the Rhambaeans, who had already put himself into communication with Lucullus; and several others.
9. Cf. V. II. Syria under Tigranes
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=31