6. The reign of Shalmaneser I., about 1290 B. C., was distinguished by his building a new city and improving his kingdom; and his successor, in 1270, signalized his reign by establishing, for a time, a complete sovereignty over Babylon, and the historical Assyrian empire is commonly dated from that event. For a century and a half there are few important records. Tiglath-Pileser I., in B. C. 1130, commenced a series of efforts to extend his dominions by conquest, which his success led him to describe with unusual detail. It embraces five campaigns and a description of the conquest of all the neighboring people. He established a compact and powerful empire, which was surrounded by wild tribes whose conquest was of little honor or value, and whom it was difficult to hold long in subjection. In a return from a campaign against Babylon, which he had conquered, he suffered a great reverse, losing the images of his gods which he kept in his camp for protection and assistance in his enterprises; and they were carried to Babylon, remaining there, it is said, 400 years. A long period of apparent quiet was followed, after more than two hundred years, by another warlike king who pushed his conquests to the Mediterranean sea. His public works were larger and more magnificent than those of any of his predecessors. He has recorded ten successful campaigns. 7. His son, Shalmaneser II., increased the number, extent and thoroughness of the conquests of his father. Still, most of the countries conquered retained their laws and government, simply paying an annual tribute, and the conquest set lightly on them. Babylon seems to have retained comparative independence. In the following reign, Babylon was captured and remained some time tributary to Assyria and the Ninus, or Iva-lush IV., whose wife was the celebrated Semiramis, still further extended Assyrian power. The wonderful tales related by Grecian historians of Semiramis are not confirmed by the monuments. She appears to have been an energetic Babylonian princess, the principal queen of Ninus, who ruled conjointly with him. The novelty of a female ruler in that rude age, and the splendor of the empire at the time, seem to have originated the fabulous tales related of her.