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
Western Asia - Cappadocia
The numerous other small states and cities of western Asia-- the kingdom of Bithynia, the Paphlagonian and Gallic principalities, the Lycian and Pamphylian confederacies, the free cities of Cyzicus and Rhodes--continued in their former circumscribed relations.
Beyond the Halys Cappadocia--after king Ariarathes V Philopator (591-624) had, chiefly by the aid of the Attalids, held his ground against his brother and rival Holophernes who was supported by Syria-- followed substantially the Pergamene policy, as respected both absolute devotion to Rome and the tendency to adopt Greek culture. He was the means of introducing that culture into the hitherto almost barbarous Cappadocia, and along with it its extravagancies also, such as the worship of Bacchus and the dissolute practices of the bands of wandering actors--the "artists" as they were called.
In reward for the fidelity to Rome, which had cost this prince his life in the struggle with the Pergamene pretender, his youthful heir Ariarathes VI was not only protected by the Romans against the usurpation attempted by the king of Pontus, but received also the south-eastern part of the kingdom of the Attalids, Lycaonia, along with the district bordering on it to the eastward reckoned in earlier times as part of Cilicia.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=96