If they delayed to join the league against him, the chief reason doubtless was the ill-feeling that continued to prevail between them and the Romans.
It was a circumstance still more ominous, that even among the Greek states firmly attached to the interests of Macedonia--the Epirots, Acarnanians, Boeotians, and Achaeans--the Acarnanians and Boeotians alone stood steadfastly by Philip.

With the Epirots the Roman envoys negotiated not without success; Amynander, king of the Athamanes, in particular closely attached himself to Rome.

Even among the Achaeans, Philip had offended many by the murder of Aratus; while on the other hand he had thereby paved the way for a more free development of the confederacy.

Under the leadership of Philopoemen (502-571, for the first time -strategus- in 546) it had reorganized its military system, recovered confidence in itself by successful conflicts with Sparta, and no longer blindly followed, as in the time of Aratus, the policy of Macedonia.

The Achaean league, which had to expect neither profit nor immediate injury from the thirst of Philip for aggrandizement, alone in all Hellas looked at this war from an impartial and national- Hellenic point of view.