(M644) Athens sought also to recover Amphipolis—a maritime city, colonized by Athenians, at the head of the Strymonican Gulf, in Macedonia, which was taken from her in the Peloponnesian war, by Brasidas. Amyntas, the king of Macedonia, seeking aid against Jason of Pheræ, whose Thessalian dominion and personal talents and ambition combined to make him a powerful potentate, consented to the right of Athens to this city. But Amyntas died not long after the assassination of Jason, and both Thessaly and Macedonia were ruled by new kings, and new complications took place. Many Thessalian cities, hostile to Alexander, the son of Jason, invoked the aid of Thebes, and Pelopidas was sent into Thessaly with an army, who took Larissa and various other cities under his protection. A large part of Thessaly thus came under the protection of Thebes. On the other hand, Alexander, who succeeded Amyntas in Macedonia, found it difficult to maintain his own dominion without holding Thessalian towns in garrison. He was also harassed by interior commotions, headed by Pausanias, and was slain. Ptolemy, of Alorus, now became regent, and administered the kingdom in the name of the minor children of Amyntas—Perdiccas and Philip. The mother of these children, Eurydice, presented herself, with her children, to Iphicrates, and invoked protection. He declared in her favor, and expelled Pausanias, and secured the sceptre of Amyntas, who had been friendly to the Athenians, to his children, under Ptolemy as regent. The younger of these children lived to overthrow the liberties of Greece. (M645) But Iphicrates did not recover Amphipolis, which was a free city, and had become attached to the Spartans after Brasidas had taken it. Iphicrates was afterward sent to assist Sparta in the desperate contest with Thebes. The Spartan allied army occupied Corinth, and guarded the passes which prevented the Thebans from penetrating into the Peloponnesus. Epaminondas broke through the defenses of the Spartans, and opened a communication with his Peloponnesian allies, and with these increased forces was more than a match for the Spartans and Athenians. He ravaged the country, induced Sicyon to abandon Sparta, and visited Arcadia to superintend the building of Megalopolis. Meanwhile Pelopidas, B.C. 368, conducted an expedition into Thessaly, to protect Larissa against Alexander of Pheræ, and to counterwork the projects of that despot, who was in league with Athens. He was successful, and then proceeded to Macedonia, and made peace with Ptolemy, who was not strong enough to resist him, taking, among other hostages to Thebes, Philip, the son of Amyntas. The Thebans and Macedonians now united to protect the freedom of Amphipolis against Athens. Pelopidas returned to Thebes, having extended her ascendency over both Thessaly and Macedonia.