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
In the Peloponnesus, the Achaean league had united the best elements
of Greece proper in a confederacy based on civilization, national
spirit, and peaceful preparation for self-defence. But the vigour
and more especially the military efficiency of the league had,
notwithstanding its outward enlargement, been arrested by the selfish
diplomacy of Aratus.
The unfortunate variances with Sparta, and the
still more lamentable invocation of Macedonian interference in the
Peloponnesus, had so completely subjected the Achaean league to
Macedonian supremacy, that the chief fortresses of the country
thenceforward received Macedonian garrisons, and the oath of
fidelity to Philip was annually taken there.
