Archelaus had been engaged at a more recent period in war with a prince of the interior named Arrhibæus,—perhaps the same person (Aristot. Polit. v, 8, 11). [121] Diodor. xiv, 92; xv, 19. Ἀπογνοὺς δὲ τὴν ἀρχὴν, Ὀλυνθίοις μὲν τὴν συνεγγὺς χώραν ἐδωρήσατο, etc. Τῷ δήμῳ τῶν Ὀλυνθίων δωρησαμένου πολλὴν τῆς ὁμόρου χώρας, διὰ τὴν ἀπόγνωσιν τῆς ἑαυτοῦ δυναστείας, etc. The flight of Amyntas, after a year’s reign, is confirmed by Dexippus ap. Syncell. p. 263. It is upon this occasion that we begin to hear again of the Chalkidians of Olynthus, and the confederacy which they gradually aggregated around their city as a centre. The confederacy seems to have taken its start from this cession of Amyntas,—or rather, to speak more properly, from his abdication; for the cession of what he could not keep was of comparatively little moment, and we shall see that he tried to resume it as soon as he acquired strength. The effect of his flight was, to break up the government of Lower or maritime Macedonia, and to leave the cities therein situated defenceless against the Illyrians or other invaders from the interior. To these cities, the only chance of security, was to throw themselves upon the Greek cities on the coast, and to organize in conjunction with the latter a confederacy for mutual support. Among all the Greeks on that coast, the most strenuous and persevering (so they had proved themselves in their former contentions against Athens when at the summit of her power) as well as the nearest, were the Chalkidians of Olynthus. These Olynthians now put themselves forward,—took into their alliance and under their protection the smaller towns of maritime Macedonia immediately near them,—and soon extended their confederacy so as to comprehend all the larger towns in this region,—including even Pella, the most considerable city of the country.[122] As they began this enterprise at a time when the Illyrians were masters of the country so as to drive Amyntas to despair and flight, we may be sure that it must have cost them serious efforts, not without great danger if they failed. We may also be sure that the cities themselves must have been willing, not to say eager, coadjutors; just as the islanders and Asiatic Greeks clung to Athens at the first formation of the confederacy of Delos. The Olynthians could have had no means of conquering even the less considerable Macedonian cities, much less Pella, by force and against the will of the inhabitants.