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
Outbreak of the Mithradatic War
In the meanwhile, certainly, there had occurred a fresh complication, for the Asiatic difficulties had rendered it imperatively necessary to declare war against Mithradates king of Pontus, and for next year (666) to destine the one consul and a consular army to Asia Minor. Had this war broken out a year earlier, the contemporary revolt of the half of Italy and of the most important of the provinces would have formed an immense peril to the Roman state. Now that the marvellous good fortune of Rome had once more been evinced in the rapid collapse of the Italian insurrection, this Asiatic war just beginning was, notwithstanding its being mixed up with the expiring Italian struggle, not of a really dangerous character; and the less so, because Mithradates in his arrogance refused the invitation of the Italians that he should afford them direct assistance.
Still it was in a high degree inconvenient. The times had gone by, when they without hesitation carried on simultaneously an Italian and a transmarine war, the state-chest was already after two years of warfare utterly exhausted, and the formation of a new army in addition to that already in the field seemed scarcely practicable. But they resorted to such expedients as they could. The sale of the sites that had from ancient times(19) remained unoccupied on and near the citadel to persons desirous of building, which yielded 9000 pounds of gold (360,000 pounds), furnished the requisite pecuniary means.
19. Cf. I. VII. Servian Wall
No new army was formed, but that which was under Sulla in Campania was destined to embark for Asia, as soon as the state of things in southern Italy should allow its departure; which might be expected, from the progress of the army operating in the north under Strabo, to happen soon.
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