The more than 3000 year long history of Ancient Egypt has been divided into 8 or 9 periods, sometimes called Kingdoms. This modern-day division is somewhat arbitrarily based on the country’s unity and wealth and the power of the central government. The Ancient Egyptians themselves did not group their rulers according to such criteria. They rather seem to have developed the notion of dynasties throughout their history. The Palermo Stone simply lists the kings one after the other, without any apparent need of grouping them. The Turin Kinglist, which is more recent, has grouped the kings according to their descendance or origin. Thus, Amenemhat I and his descendants, are described as the kings of Itj-Tawi, the capital whence they ruled. We owe the division into 30 dynasties as we use it now to Manetho, an Egyptian priest who lived at the beginning of the Ptolemaic Era. In many cases, however, it is not clear why Manetho has grouped some kings into one dynasty and other kings into another. The 18th Dynasty, for instance, starts with Ahmose, a brother of the last king in Manetho’s 17th Dynasty. Theoritically, Ahmose and Kamose should thus have been grouped in the same dynasty. Thutmosis I, on the other hand, does not appear to have been related to his predecessor, Amenhotep I, but still both kings are grouped in the 18th Dynasty.