Letopolis (Greek: Λητοῦς Πόλις) was an ancient Egyptian city under the patronage of Horus located on the western bank of the Nile, in the Sapi-Res Nome. A city of the Old Kingdom, Letopolis had largely been abandoned to the desert by the end of the Ptolemaic period.
Many years prior to 49 BCE, the city was home to a cult dedicated to Sekhmet, the Egyptian goddess of war, fire, and healing. When Egypt was experiencing a period of desertification thought to have been caused by hubris, the priests made an invocation to Sekhmet at the cost of their own lives giving her, as a personification of the desert, the city in the hopes that Nile and the rest of Egypt would be spared to prosper once more. In the years that followed, the sands slowly claimed large portions of the city, including the Temple of a Million Years which had been dedicated to Sekhmet.
When Taharqa, the city planner of Sais and secretly a member of the Order of the Ancients, became the city's steward, he initiated plans to reclaim the city from the encroaching desert and elected to reestablish Horus as the city's patron god, building the Temple of Horus by the Nile.
In 48 BCE, the Medjay, Bayek, travelled to the city in search of Taharqa, believing he may have information regarding to the Scarab, unaware that Taharqa was in fact the Scarab he was searching for. Upon his arrival in the city, Bayek was greeted by Ramessu, a crier who welcomed him and offered him a place of residence in the city. Bayek refused the offer and was sent to talk to Nehi, a new arrival from Yamu.
Bayek's investigation of the Temple of a Million Years and the Old Library under the newly constructed Temple of Horus revealed the city's history to him. This lead him to believe that Taharqa's ambitious project would not long outlive the man himself.