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 peace which Sulla had concluded in 670 with Mithradates, king of Pontus,(2) and of which the treaty with Murena in 673(3) was essentially a repetition, bore throughout the stamp of a provisional arrangement to meet the exigencies of the moment; and the relations of the Romans with Tigranes, king of Armenia, with whom they had de facto waged war, remained wholly untouched in this peace.
2. Cf. IV. VIII. Preliminaries of Delium, IV. VIII. Peace at Dardanus
3. Cf. IV. IX. Fresh Difficulties with Mithradates
Tigranes had with right regarded this as a tacit permission to bring the Roman possessions in Asia under his power. If these were not to be abandoned, it was necessary to come to terms amicably or by force with the new great-king of Asia.
In the preceding chapter we have described the movements in Italy and Spain connected with the proceedings of the democracy, and their subjugation by the senatorial government. In the present chapter we shall review the external government, as the authorities installed by Sulla conducted or failed to conduct it.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=2