After the obliteration of Nineveh the Medes and Chaldaeans divided western Asia between them. A family alliance was concluded between Nabopolassar and Cyaxares at the moment of concerting the attack which was to have such a brilliant success, and either in consequence of that alliance or for some unknown motive, the two nations remained good friends after their common victory. The Medes kept Assyria, and extended themselves to the north, over the whole country between the Caspian and the Black Sea. They would have carried their frontiers to the AEgaean but for the existence of the Lydian monarchy, which arrested them on the left bank of the Halys. To the south of these regions the SECOND CHALDAEAN EMPIRE took shape (625-536 B.C.). It made no effort to expand eastwards over that plateau of Iran where the Aryan element, as represented by the Medes and soon afterwards by the Persians, had acquired an ever-increasing preponderance, but it pretended to the sovereignty of Egypt and Syria. In the former country, however, the Saite princes had rekindled the national spirit, and the frontiers were held successfully against the invaders. It was otherwise with the Jewish people. Sargon had taken Samaria and put an end to the Israelitish kingdom; that of Judah was destroyed by Nebuchadnezzar. Thanks to its insular position, Tyre escaped the lot of Jerusalem, but the rest of Phoenicia and all northern Syria were subdued by Babylon. In all this region the Semitic element had long been encroaching upon those other elements which had preceded and been associated with it at the commencement. In all Mesopotamia only one tongue was spoken and written, the tongue we now know as _Assyrian_, but should call _Assyro-Chaldaean_. The differences of dialect between north and south were of little importance, and the language in question is that of the inscriptions in both countries. Another change requires to be mentioned. Our readers will remember the names of Ur, Erech, and many other cities which played a great part in the early history of the country, and were all capitals in turn. Babylon, however, in time acquired an unquestioned supremacy over them all. The residence of the Assyrian viceroys during the supremacy of the northern kingdom, it became the metropolis of the new empire after the fall of Nineveh. Without having lost either their population or their prosperity, the other cities sunk to the condition of provincial towns.