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
Sulla Sent to Cappadocia
The decrees sounded energetic enough; only it was an error, that instead of sending an army they directed the governor of Cilicia, Lucius Sulla, with the handful of troops whom he commanded there against the pirates and robbers, to intervene in Cappadocia. Fortunately the remembrance of the former energy of the Romans defended their interests in the east better than their present government did, and the energy and dexterity of the governor supplied what the senate lacked in both respects.
Mithradates kept back and contented himself with inducing Tigranes the great-king of Armenia, who held a more free position with reference to the Romans than he did, to send troops to Cappadocia. Sulla quickly collected his forces and the contingents of the Asiatic allies, crossed the Taurus, and drove the governor Gordius along with his Armenian auxiliaries out of Cappadocia. This proved effectual. Mithradates yielded on all points; Gordius had to assume the blame of the Cappadocian troubles, and the pseudo-Ariarathes disappeared; the election of king, which the Pontic faction had vainly attempted to direct towards Gordius, fell on the respected Cappadocian Ariobarzanes.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=29