The Great Pyramid of Giza, also known the Pyramid of Khufu, is an Egyptian pyramid built during the reign of the Pharaoh Khufu, around the 2580 to 2560 BCE. Located in Giza, the pyramid was built atop the ancient Isu complex Khesesh Em Sesh Em Eeneb and served as the Khufu's tomb.
In 48 BCE, the Medjay Bayek of Siwa travelled to the pyramid in pursuit of Khaliset, a member of the Order of the Ancients, having learned about her activities from people in the area and from clues within her lair. Exploring the pyramid, Bayek deciphered an Old Kingdom stele and discovered an entrance which led to the Isu complex.
In 46 BCE, the Hidden Ones rushed to the pyramid in order to prevent the "Ibis Reborn" breaking into the Isu vault beneath the pyramid. On their way, they took down several members of his sect. Entering the pyramid, the "Ibis Reborn" used several decoys to delay the Hidden Ones. Since he didn't know how to activate the pedestal, he turned his anger to the Hidden Ones who faced him. The Hidden Ones unveiled his true face after defeating the "Ibis Reborn". He wasn't the resurrected Ibis of the Order of the Ancients as he had claimed, but a priest named Menkhtu, a follower of the deceased Medunamun.