In 48 BCE, while on his way to Memphis to map out the city, Corteseos was knocked out by a boy named Apheru in the mastabas outside the Great Pyramid of Giza. The Medjay Bayek of Siwa came across his unconscious body in the mastabas before being knocked out as well. Apheru, together with his brother Ngozi and sister Neema, took Corteseos' notes and Bayek's heron feather, leaving them in the desert.
When Corteseos regained conscious, he helped Bayek up on his feet and explained his situation to him. Bayek promised to help Corteseos recover his notes, before leaving to follow the tracks left behind by the thieves.
Bayek fulfilled his promise, returning to Corteseos with his notes. When the children met Corteseos, their victim, Bayek helped to clear up the misunderstanding, telling Corteseos that the children had been forced to steal for bandits from the Adorer of Thoth Tomb. Upon learning that the kids needed passage back to the house of Nef in Memphis, Corteseos offered to accompany them and their dog Anta, and they agreed.