Thus ended in disaster the first Persian invasion of Europe. It was to be followed by others in later years, equally disastrous to the invaders. As for the despots of Ionia, who had through selfishness lost the chance of freeing their native land, they were to live to see, before many years, Ionia desolated by the Persian tyrant whom they had saved from irretrievable ruin. We shall tell how this came about, as a sequel to the story of the invasion of Scythia. Histiaeus, despot of Miletus, whose advice had saved the bridge for Darius, was richly rewarded for his service, and attended Darius on his return to Susa, the Persian capital, leaving his son-in-law Aristagoras in command at Miletus. Some ten years afterwards this regent of Miletus made an attempt, with Persian aid, to capture the island of Naxos. The effort failed, and Aristagoras, against whom the Persians were incensed by their defeat and their losses, was threatened with ruin. He began to think of a revolt from Persian rule. While thus mentally engaged, he received a strangely-sent message from Histiaeus, who was still detained at Susa, and who eagerly desired to get away from dancing attendance at court and return to his kingdom. Histiaeus advised his regent to revolt. But as this message was far too dangerous to be sent by any ordinary channels, he adopted an extraordinary method to insure its secrecy. Selecting one of his most trusty slaves, Histiaeus had his head shaved, and then pricked or tattooed upon the bare scalp the message he wished to send. Keeping the slave in seclusion until his hair had grown again, he sent him to Miletus, where he was instructed simply to tell Aristagoras to shave and examine his head. Aristagoras did so, read the tattooed message, and immediately took steps to obey. Word of the proposed revolt was sent by him to the other cities along the coast, and all were found ready to join in the attempt to secure freedom. Not only the coast settlements, but the island of Cyprus, joined in the revolt. At the appointed time all the coast region of Asia Minor suddenly burst into a flame of war. Aristagoras hurried to Greece for aid, seeking it first at Sparta. Finding no help there, he went to Athens, which city lent him twenty ships,--a gift for which it was to pay dearly in later years. Hurrying back with this small reinforcement, he quickly organized an expedition to assail the Persians at the centre of their power. Marching hastily to Sardis, the capital of Asia Minor, the revolted Ionians took and burned that city. But the Persians, gathering in numbers, defeated and drove them back to the coast, where the Athenians, weary of the enterprise, took to their ships and hastened home.