Kingdom and the beginning of the Second Intermediate Period. This analysis is rejected by Ryholt and Baker however, who note that the stele of Seheqenre Sankhptahi, reigning toward the end of the dynasty, strongly suggests that he reigned over Memphis. The stele is of unknown provenance. The chronological position of a number of attested rulers could not be conclusively determined due to a lack of evidence: Sobekhotep I and II Ryholt posits a ruler named "Sobkhotep I Sekhemre Khutawy" as the first king of this dynasty. This is now the dominant hypothesis in Egyptology and Sobekhotep Sekhemre Khutawy is referred to as Sobekhotep I in this article. Ryholt thus credits Sekhemre Khutawy Sobkhotep I with a reign of 3 to 4 years c. 1800 BC and proposes that Khaankhre Sobekhotep II reigned c. 20 years later in 1780 BC. Dodson and Hilton similarly believe that Sekhemre Khutawy Sobekhotep predated Khaankhre Sobekhotep. Successors After allowing discipline at the southern forts to deteriorate, the government eventually withdrew its garrisons and, not long afterward, the forts were reoccupied by the rising Nubian state of Kush. In the north, Lower Egypt was overrun by the Hyksos, a Semitic people from across the Sinai. An independent line of kings created Dynasty XIV that arose in the western Delta during later Dynasty XIII. According to Manetho, into this unstable mix came invaders from the east called the Hyksos who seized Egypt "without striking a blow; and having overpowered the rulers of the land, they then burned our cities ruthlessly, razed to the ground the temples of gods..." Their regime, called Dynasty XV, was claimed to have replaced Dynasties XIII and XIV in most of the country. However, recent archaeological finds at Edfu could indicate that the Hyksos 15th dynasty was already in existence at least by the mid-13th dynasty reign of king Sobekhotep IV. In a recently published paper in Egypt and the Levant, Nadine Moeller, Gregory Marouard and N. Ayers discuss the discovery of an important early 12th dynasty Middle Kingdom administrative building in the eastern Tell Edfu area of Upper Egypt which was in continual use into the early Second Intermediate Period until the 17th dynasty, when its remains were sealed up by a large silo court. Fieldwork by Egyptologists in 2010 and 2011 into the remains of the former 12th dynasty building which was also used in the 13th dynasty led to the