(From a statue)] [Sidenote: [_ca._ 2370-2250 B.C.]] The co-regency of Usertsen I with Amenemhat I, instituted ten years before the king’s death, led to Usertsen’s being accepted as successor to his father without any opposition. And following his parent’s example, this king (after forty-two years) appointed his son, Amenemhat II, to be co-regent with himself; and he, thirty-two years later, did the same with Usertsen II; Amenemhat III and Amenemhat IV also reigned a long time together. The only reigns in which there is no proof of co-regency are those of Usertsen III and Queen Sebek-neferu-Ra (the Schemiophris of Manetho), who was the last of the dynasty, which had lasted 213 years, 1 month, and 27 days. The history of the XIIth Egyptian dynasty is certainly given with greater accuracy and completeness than that of any of the others. In spite of the deficiencies in the biographies of the eight monarchs, and the accounts of their wars, we have an uninterrupted survey of the development of their policy, and even after the lapse of four thousand years and more, we can form a fair idea of the Egypt of the period. As engineers, soldiers, friends of art, and patrons of agriculture, they were indefatigable in their work of aggrandising the country. With the enlargement of the boundaries of the kingdom, the hordes of barbarians on the frontiers were dispersed, Nubia was conquered; the valley of the Middle Nile, from the First Cataract to the Fourth, was colonised; the supply of water was more equalised by the creation of Lake Mœris and a system of canals; and towns like Heliopolis, Thebes, Tanis, and a hundred others of less repute, were adorned with fine buildings. Egypt, in fact, at this time, was in a most prosperous state, and if later she obtained more renown by her Asiatic wars and distant conquests, the period of this dynasty, when each generation of Pharaohs followed in the other’s steps of good administration, was the most happy and peaceful of all. The two scenes of warfare of the Pharaohs at this period were Syria on the east of the Delta, and Nubia, properly so called, on the south of Elephantine. One would have thought that the large tracts of sand, separating the Syrians from Egypt, would have prevented any incursions from that quarter. But the nomadic tribes made such inroads on that district that a series of fortresses had to be built from the Red Sea to the Nile, to protect the entrance of the Wady Tumilat from the hordes; and this wall, begun by Amenemhat and continued by his successors, marked the extreme limit, at that time, of the empire of the Pharaohs in this direction. Beyond stretched the desert, a world almost unknown to the Egyptians at that time.