Antigonus III Doson
The increased size of the league meant a bigger citizen army and more wealth, which was used to hire mercenaries, but it also led to hostility from the remaining independent Greek states, especially Elis, the Aetolian League and Sparta, which perceived the Achaeans as a threat. Corinth was followed by Megalopolis in 235 BC and Argos in 229 BC. However the league soon ran into difficulties with the revived Sparta of Cleomenes III. Aratus was forced to call in the aid of the Macedonian King, Antigonus III Doson, who defeated Cleomenes in Sellasia. Antigonus Doson re-established Macedonian control over much of the region.