Lepsius believed that he had found the Labyrinth at Fayoum, and he was perhaps right in so thinking. But, even if this remarkable ancient building should be re-discovered on some other site of the old “lake country,” yet to Lepsius would still belong the credit of having determined the position of Lake Moeris, first indicated by Linant de Bellefonds, and of having proved that the Pharaoh Amenemha III., of the twelfth dynasty, was the Moeris of the Greeks.[51] He also was the first to investigate and make known all that was accomplished by this prince in regulating the inundation of the Nile. We know that his researches in Egypt and Ethiopia extended even beyond the limits of the region of monuments. Within that zone he has, if we may be allowed the expression, left no corner unexplored. He met with the most abundant returns at Beni Hassan, Thebes, (especially upon the return journey) Gebel Silsile, the island of Philae, Abu Simbel on the second cataract, among the ruins of Ethiopian Meroë far in the South, and also on the peninsula of Sinai. Within the bounds of the temple of Isis, on the lovely island beyond the first cataract, he made a succession of discoveries, upon which he afterwards based great and original works. He first found here an ecclesiastical ordinance,[52] similar to the decree of Rosetta, drawn up in two languages, that is in hieroglyphics, and also in the demotic (popular) writing and language. The numerous names of the Ptolemies, which occurred in the inscriptions of the temple of Isis, also impelled him to study more thoroughly the succession of the Egyptian kings of the house of the Lagidae and to determine finally the order of this series of rulers, of such great importance for the history of other countries.[53] Here, as everywhere, he paid special attention to the Greek inscriptions, which are very numerous on Philae. By his sagacity and quick insight great additions were made to the Egypto-Grecian inscriptions previously collected by Letronne and others. Those which had been previously known received manifold corrections and additions owing to the extreme accuracy peculiar to him. He afterwards devoted a special treatise to the hieroglyphic form of the name of the Ionians.[54]