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
The Roman government, appealed to for aid by the kings Ariobarzanes
and Nicomedes in person, despatched to Asia Minor in support of
Lucius Cassius who was governor there the consular Manius Aquillius--
an officer tried in the Cimbrian and Sicilian wars--not, however,
as general at the head of an army, but as an ambassador, and
directed the Asiatic client states and Mithradates in particular
to lend armed assistance in case of need.
The result was as
it had been two years before. The Roman officer accomplished the
commission entrusted to him with the aid of the small Roman corps
which the governor of the province of Asia had at his disposal, and
of the levy of the Phrygians and Galatians; king Nicomedes and king
Ariobarzanes again ascended their tottering thrones; Mithradates
under various pretexts evaded the summons to furnish contingents,
but gave to the Romans no open resistance; on the contrary
the Bithynian pretender Socrates was even put to death by
his orders (664).