The dynasties of the pharaohs are divided in groups of kings united by kinship or by their royal residence. In total, a subdivision into 30 dynasties was adopted in Egyptology based on the written sources of Manetho, a Greek historian and priest, who reconstructed the history of ancient Egypt in his study “Aegyptiaca” (c. 282–246 BCE). To write his work (known to us only thanks to later historians) Manetho consulted ancient Egyptian official documents containing lists of pharaohs. Among the examples of these lists, one of the most important is the "Papyrus of Kings" - also known as the "List of Kings" -, which arrived at Museo Egizio due to a purchase made by the consul Drovetti around 1820.
Despite its value for the history of ancient Egypt, the Papyrus of Kings was written on “recycled paper”. The recto (“the front”) of the papyrus, preserves a tax register dated to the time of King Ramesses II (1279–1213 BCE). It mentions numerous high officials of the temples of Sobek and Amun and several superintendents at the head of the fortresses located along the southern border of Egypt. The list of kings was written later, on the verso - “the back” of the scroll.