Thus once again the Assyrian Empire came into being as the predominant world Power, extending from the land of the Hittites into the heart of Babylonia. Its cities were enriched by the immense quantities of booty captured by its warrior king, while the coffers of state were glutted with the tribute of subject States. Fortifications were renewed, temples were built, and great gifts were lavished on the priesthood. Artists and artisans were kept fully employed restoring the faded splendours of the Old Empire, and everywhere thousands of slaves laboured to make the neglected land prosperous as of old. Canals were repaired and reopened; the earthworks and quay wall of Ashur were strengthened, and its great wall was entirely rebuilt, faced with a rampart of earth, and protected once again by a deep moat. The royal palace was enlarged and redecorated. Meanwhile Babylonia was wasted by civil war and invasions. It was entered more than once by the Aramaeans, who pillaged several cities in the north and the south. Then the throne was seized by Adad-aplu-iddina, the grandson of "a nobody", who reigned for about ten years. He was given recognition, however, by the Assyrian king, Ashur-bel-kala, son of Tiglath-pileser I, who married his daughter, and apparently restored to him Sippar and Babylon after receiving a handsome dowry. Ashur-bel-kala died without issue, and was succeeded by his brother, Shamshi-Adad. An obscure period followed. In Babylonia there were two weak dynasties in less than half a century, and thereafter an Elamite Dynasty which lasted about six years. An Eighth Dynasty ensued, and lasted between fifty and sixty years. The records of its early kings are exceedingly meagre and their order uncertain. During the reign of Nabu-mukin-apli, who was perhaps the fourth monarch, the Aramaeans constantly raided the land and hovered about Babylon. The names of two or three kings who succeeded Nabu-mukin-apli are unknown. A century and a half after Tiglath-pileser I conquered the north Syrian possessions of the Hittites, the Old Assyrian Empire reached the close of its second and last period. It had suffered gradual decline, under a series of inert and luxury-loving kings, until it was unable to withstand the gradual encroachment on every side of the restless hill tribes, who were ever ready to revolt when the authority of Ashur was not asserted at the point of the sword.