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
Negotiations for Peace
Mithradates attempted to negotiate. Under other circumstances no doubt the author of the edict for the Ephesian massacre could never have cherished the hope of being admitted at all to terms of peace with Rome; but amidst the internal convulsions of the Roman republic, when the ruling government had declared the general sent against Mithradates an outlaw and subjected his partisans at home to the most fearful persecutions, when one Roman general opposed the other and yet both stood opposed to the same foe, he hoped that he should be able to obtain not merely a peace, but a favourable peace.
He had the choice of applying to Sulla or to Fimbria; he caused negotiations to be instituted with both, yet it seems from the first to have been his design to come to terms with Sulla, who, at least from the king's point of view, seemed decidedly superior to his rival. His general Archelaus, a instructed by his master, asked Sulla to cede Asia to the king and to expect in return the king's aid against the democratic party in Rome. But Sulla, cool and clear as ever, while urgently desiring a speedy settlement of Asiatic affairs on account of the position of things in Italy, estimated the advantages of the Cappadocian alliance for the war impending over him in Italy as very slight, and was altogether too much of a Roman to consent to so disgraceful and so injurious a concession.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=64