A separate and independent Ethiopian culture finally began to arise during the middle empire of Egypt and centered at Nepata and Meroe. Widespread trade in gold, ivory, precious stones, skins, wood, and works of handicraft arose.[14] The Negro began to figure as the great trader of Egypt. This new wealth of Ethiopia excited the cupidity of the Pharaohs and led to aggression and larger intercourse, until at last, when the dread Hyksos appeared, Ethiopia became both a physical and cultural refuge for conquered Egypt. The legitimate Pharaohs moved to Thebes, nearer the boundaries of Ethiopia, and from here, under Negroid rulers, Lower Egypt was redeemed. The ensuing new empire witnessed the gradual incorporation of Ethiopia into Egypt, although the darker kingdom continued to resist. Both mulatto Pharaohs, Aahmes and Amenhotep I, sent expeditions into Ethiopia, and in the latter's day sons of the reigning Pharaoh began to assume the title of "Royal Son of Kush" in some such way as the son of the King of England becomes the Prince of Wales. Trade relations were renewed with Punt under circumstances which lead us to place that land in the region of the African lakes. The Sudanese tribes were aroused by these and other incursions, until the revolts became formidable in the fourteenth century before Christ. Egyptian culture, however, gradually conquered Ethiopia where her armies could not, and Egyptian religion and civil rule began to center in the darker kingdom. When, therefore, Shesheng I, the Libyan, usurped the throne of the Pharaohs in the tenth century B.C., the Egyptian legitimate dynasty went to Nepata as king priests and established a theocratic monarchy. Gathering strength, the Ethiopian kingdom under this dynasty expanded north about 750 B.C. and for a century ruled all Egypt. The first king, Pankhy, was Egyptian bred and not noticeably Negroid, but his successors showed more and more evidence of Negro blood--Kashta the Kushite, Shabaka, Tarharqa, and Tanutamen. During the century of Ethiopian rule a royal son was appointed to rule Egypt, just as formerly a royal Egyptian had ruled Kush. In many ways this Ethiopian kingdom showed its Negro peculiarities: first, in its worship of distinctly Sudanese gods; secondly, in the rigid custom of female succession in the kingdom, and thirdly, by the election of kings from the various royal claimants to the throne. "It was the heyday of the Negro. For the greater part of the century ... Egypt itself was subject to the blacks, just as in the new empire the Sudan had been subject to Egypt."[15]