It would seem that a few years after the peace of Antalkidas, Sparta became somewhat ashamed of having surrendered the Asiatic Greeks to Persia; and that king Agesipolis and other leading Spartans encouraged the scheme of a fresh Grecian expedition against Asia, in compliance with propositions from some disaffected subjects of Artaxerxes.[107] Upon some such project, currently discussed though never realized, Isokrates probably built his Panegyrical Oration, composed in a lofty strain of patriotic eloquence (380 B.C.) to stimulate both Sparta and Athens in the cause, and calling on both, as joint chiefs of Greece, to suspend dissensions at home for a great Pan-hellenic manifestation against the common enemy abroad. But whatever ideas of this kind the Spartan leaders may have entertained, their attention was taken off, about 382 B.C. by movements in a more remote region of the Grecian world, which led to important consequences. [107] Diodor. xv, 9, 19. Since the year 414 B.C. (when the Athenians were engaged in the siege of Syracuse), we have heard nothing either of the kings of Macedonia, or of the Chalkidic Grecian cities in the peninsula of Thrace adjoining Macedonia. Down to that year, Athens still retained a portion of her maritime empire in those regions. The Platæans were still in possession of Skiônê (on the isthmus of Pallênê) which she had assigned to them; while the Athenian admiral Euetion, seconded by many hired Thracians, and even by Perdikkas king of Macedonia, undertook a fruitless siege to reconquer Amphipolis on the Strymon.[108] But the fatal disaster at Syracuse having disabled Athens from maintaining such distant interests, they were lost to her along with her remaining empire,—perhaps earlier; though we do not know how. At the same time, during the last years of the Peloponnesian war, the kingdom of Macedonia greatly increased in power; partly, we may conceive, from the helpless condition of Athens,—but still more from the abilities and energy of Archelaus, son and successor of Perdikkas. [108] Thucyd. vii, 9.