The removal of the centre of the kingdom from Memphis, which is noticeable under the family of Pepi, was completely carried out under a later house, which is stated in the lists to belong to Thebes--the eleventh and twelfth dynasty of Manetho. Upper Egypt became the seat of the royal power; Thebes (the No-Amon, _i.e._ possession of Ammon, of the Hebrews) took her place beside Memphis. The princes of this new dynasty are no longer called in the monuments the lords of Upper and Lower Egypt, but the "lords of both lands;" they always wear both crowns. Hence it is possible that this royal house in the first instance ruled over Upper Egypt only from Thebes, and that for a long time Upper and Lower Egypt existed side by side independently, till the kings of Thebes succeeded in reducing Lower Egypt under their dominion. Of Amenemha, the first king of this house, who ruled over Upper and Lower Egypt (2380-2371 B.C.), a colossal figure of red granite is still in existence, which was discovered in Lower Egypt at Tanis (San), not far from Lake Menzaleh.[154] His power must have extended up the Nile over the adjacent part of Nubia, for a pillar discovered there informs us that he intrusted an officer with the superintendence of the gold mines in Nubia.[155] His successor, Sesurtesen I. (2371-2325 B.C.), erected a temple to Ammon at Thebes, and set up obelisks, _i.e._ pointed monolithic pillars, dedicated to the sun-god, in Lower Egypt, in Fayum, and at Heliopolis. The obelisk at Fayum, not far from the ancient Arsinoe, was about forty feet in height; it has been broken by the fall into two pieces. The obelisk of Heliopolis is sixty feet in height; it still towers over the ruins of this city, near the village of Matarieh. It is not the first obelisk erected in Egypt, for the inscriptions of Chufu mention an obelisk erected by that king, but it is the oldest which has come down to our time. The inscription, repeated on all four sides, runs thus:--"Horus, the life of that which is born, the child of the sun, Sesurtesen, who is beloved by the spirits of Heliopolis, who will live for ever, the golden hawk, the life of that which is born, this gracious god has erected this obelisk at the beginning of the great festival. He has erected it who assures us of life for ever."[156] That this king also ruled in Nubia, and forced his way far up the Nile above Egypt, is proved by a monument in Nubia on the cataracts of the Wadi Halfa; a pillar, on which is depicted Sesurtesen, representing Nubians and negroes, the prisoners of eight nations or tribes, to the god Horus.[157] In the rock tombs of Beni Hassan is buried an officer of this king, Amenj, overseer of the canton of Hermopolis (Ashmunein). The inscription tells us that Amenj had served the king when on a campaign to destroy his enemies; that he had approached the land of Cush, and reached the limits of the earth. The king had returned in peace after the overthrow of his enemies.