of existence, began to show signs of disruption, and the Thasians, wishing to break off from it, appealed for aid to Sparta (B.C. 465), the Spartans were pre- vented from giving it, by a great disaster at home. A severe earthquake in that year caused much loss of life and damage to property and buildings; and the helots—smarting under years of forced labour and oppression—were in rebellion, both in Laconia and Messenia.
Repulsed by King Archidamus in their attempt to take Sparta itself the helots collected on Mount Ithome, where they maintained themselves for ten years. During that time all the energies of Sparta and her allies were devoted to the siege. The Athenians, therefore, during these years had nothing to fear from Spartan interference, though it was well known that jealousy of her powers in the Aegean was growing rapidly in Sparta. This was emphasised by an incident connected with the siege of Ithome. Among other requests for aid the Spartan had sent one to Athens. Cimon, who had done such brilliant service for the Delian confederacy, was head of the party at Athens which desired a close alliance with Sparta. He persuaded the people to send the aid requested under his own leadership. But when he arrived, the Spartan generals, who had either not approved of the invitation to Athens or had repented of it, dismissed him with scant courtesy. The feeling aroused at Athens by this rebuff was sufficiently violent to cause the ostracism of Cimon (B.C. 461).
This event began a new era with the advent to supreme influence of Pericles, who had for some time
