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
For this very reason--because he hoped and planned while still
there was life in him--he remained dangerous to the Romans so long as
he lived, as an aged refugee no less than when he had marched forth
with his hundred thousands to wrest Greece and Macedonia
from the Romans. The restless old man made his way in the year 689
from Dioscurias amidst unspeakable hardships partly by land partly
by sea to the kingdom of Panticapaeum, where by his reputation
and his numerous retainers he drove his renegade son Machares
from the throne and compelled him to put himself to death.
From this point he attempted once more to negotiate with the Romans;
he besought that his paternal kingdom might be restored to him,
and declared himself ready to recognize the supremacy of Rome
and to pay tribute as a vassal. But Pompeius refused to grant
the king a position in which he would have begun the old game afresh,
and insisted on his personal submission.
