Cyaxares the Median meanwhile raised up in Ecbatana a rival power to that of Babylon, although he devoted himself to warlike expeditions more than to the adornment of his capital. He penetrated with his invincible troops as far to the west as Lydia in Asia Minor, then ruled by the father of Croesus, and thus became known to the Ionian cities which the Greeks had colonized. After a brilliant reign, Cyaxares transmitted his empire to an unworthy son,--Astyages, the grandfather of Cyrus, whose loss of the throne has been already related. With Astyages perished the Median Empire, which had lasted only about one hundred years, and Media was incorporated with Persia. Henceforth the Medes and Persians are spoken of as virtually one nation, similar in religion and customs, and furnishing equally the best cavalry in the world. Under Cyrus they became the ascendent power in Asia, and maintained their ascendency until their conquest by Alexander. The union between Media and Persia was probably as complete as that between Burgundy and France, or that of Scotland with England. Indeed, Media now became the residence of the Persian kings, whose palaces at Ecbatana, Susa, and Persepolis nearly rivalled those of Babylon. Even modern Persia comprises the ancient Media. The reign of Cyrus properly begins with the conquest of Media, or rather its union with Persia, B.C. 549. We know, however, but little of the career of Cyrus after he became monarch of both Persia and Media, until he was forty years of age. He was probably engaged in the conquest of various barbaric hordes before his memorable Lydian campaign. But we are in ignorance of his most active years, when he was exposed to the greatest dangers and hardships, and when he became perfected in the military art, as in the case of Caesar amid the marshes and forests of Gaul and Belgium. The fame of Caesar rests as much on his conquests of the Celtic barbarians of Europe as on his conflict with Pompey; but whether Cyrus obtained military fame or not in his wars against the Turanians, he doubtless proved himself a benefactor to humanity more in arresting the tide of Scythian invasion than by those conquests which have given him immortality.