When Cyrus had cemented his empire by the conquest of the Turanian nations, especially those that dwelt between the Caspian and Black seas, his attention was drawn to Lydia, the most powerful kingdom of western Asia, whose monarch, Croesus, reigned at Sardis in Oriental magnificence. Lydia was not much known to distant States until the reign of Gyges, about 716 B.C., who made war on the Dorian and Ionian Greek colonies on the coast of Asia Minor, the chief of which were Miletus, Smyrna, Colophon, and Ephesus. His successor Ardys continued this warfare, but was obliged to desist because of an invasion of the Cimmerians,--barbarians from beyond the Caucasus, driven away from their homes by the Scythians. His grandson Alyattes, greatest of the Lydian monarchs, succeeded in expelling the Cimmerians from Lydia. After subduing some of the maritime cities of Asia Minor, this monarch faced the Medes, who had advanced their empire to the river Halys, the eastern boundary of Lydia, which flows northwardly into the Euxine. For five years Alyattes fought the Medes under Cyaxares with varying success, and the war ended by the marriage of the daughter of the Lydian king with Astyages. After this, Alyattes reigned forty-three years, and was buried in a tomb whose magnificence was little short of the grandest of the Egyptian monuments. Croesus, his son, entered upon a career which reminds us of Solomon, the inheritor of the conquests of David. Like the Jewish monarch, Croesus was rich, luxurious, and intellectual. His wealth, obtained chiefly from the mines of his kingdom, was a marvel to the Greeks. His capital Sardis became the largest in western Asia, and one of the most luxurious cities known to antiquity, whither resorted travellers from all parts of the world, attracted by the magnificence of the court, among whom was Solon himself, the great Athenian law-giver. Croesus continued the warfare on the Greek cities of Asia, and forced them to become his tributaries. He brought under his sway most of the nations to the west of the Halys, and though never so great a warrior as his father, he became very powerful. He was as generous in his gifts as he was magnificent in his tastes. His offerings to the oracle at Delphi were unprecedented in their value, when he sought advice as to the wisdom of engaging in war with Cyrus. Of the three great Asian empires, Croesus now saw his father's ally, Babylon, under a weak and dissolute ruler; Media, absorbed into Persia under the power of a valiant and successful conqueror; and his own empire, Lydia, threatened with attack by the growing ambition of Persia. Herodotus says he "was led to consider whether it were possible to check the growing power of that people."