Demetrius II, son of Antigonus II, his accession was followed almost at once by several major changes in areas affecting Macedonia. This chapter discusses movements of Demetrius in the first half of the social war against the Achaean leagues. The political revolution in Epirus had consequences as significant for Rome as they were for Greece and Macedonia. Confronted with an ultimatum to join the Aetolian League, the Acarnanians in Medeon sent an appeal to Demetrius to which, probably owing to trouble on his northern frontiers, he was unable to respond. The Spartan revolution carried out in the autumn of 227 and consolidated during the following winter increased the manpower available to Cleomenes and clearly rendered him a more formidable opponent to the Achaean League. The naval expedition which Antigonus led against Caria in the spring or summer of 227 was a striking reaffirmation of Macedonian naval interests, dormant since the reign of Antigonus II.