The Temple of Amun was the principal temple complex located in Siwa, serving as the residence for the exalted Oracle of Amun that guided the affairs of the village. It was built directly above an Isu vault which was incorporated into the temple as an underground chamber.
In 49 BCE, Pharaoh Ptolemy XIII appointed Medunamun, a member of the Order of the Ancients, as Oracle of Amun in a bid to consolidate his control over the remote, dissident town. A year later, the Medjay, Bayek, returned to Siwa, where he freed a group of farmers from their cage in the temple including Teremun, who had died from his wounds. He later carried his body out of the temple to his farm.
Sometime thereafter, Bayek returned infiltrating the temple complex and freed the priests abused under Medunamun's tenure. Thereafter, Bayek assassinated Medunamun, thus ending his reign of tyranny.