Realizing how impossible it would be to accomplish his reform in the ancient city of Thebes, the king determined to change his capital. Thebes had long been the religious as well as the political center, and the worship of Amon was fundamentally associated with the city. In order to set up the worship of one deity, Aton--the Solar Disk--in place of Amon, with the complex system of deities, Amenhotep IV. went north of Thebes and began the construction of a new capital[5] which was never completed. Its name signified "The Horizon of the Solar Disk." Within this new capital the new religion was to be firmly established and thence spread throughout the realm. Just what teachings this religion embodied is not now understood. While the sun was worshipped in a new form as Aton, this may have been merely symbolic of one God--one Spirit, felt to be one and alone. Acceptance of the Solar Disk religion necessitated an abandoning of all earlier deities, especially the powerful Amon, and his name was commanded to be stricken from all monuments throughout the land. The result of this religious crusade was a total failure. Amenhotep IV. realized how great was the innovation he sought to make, but he underestimated the strength of the priests of Amon, the treasures of whose temple at Thebes were loaded with the spoil of Asia. This "reform" while in line with the theology, was utterly at variance with the popular religion of the day. Angered beyond measure by the injury to their faith, the people rose up against the new teaching. The old-time worship was reinstated, the former deities elevated to their former dignity, and the Eighteenth dynasty which had begun so auspiciously came to an end in confusion and disorder. [Illustration: GREAT PYRAMID, SPHINX AND TEMPLE OF ARMACHIS.] KARNAK. The temple of Karnak belongs to both the Eighteenth and Nineteenth dynasties. Thutmose III., Amenhotep II. and Amenhotep III. each added rooms to the great structure, although it was left for Seti I. to build the crowning Hall of Pillars. Three centuries witnessed its erection and many kings contributed to its greatness. Most famous of all Theban architecture, it is still mighty in its ruins. Karnak is the name of one of the four districts into which the irregular Nile divided the city of Thebes. From this district, or ward, the great temple dedicated to Amon--ancient deity of Thebes--took its name.