Heb Sed
Around regnal year two or three, Amenhotep IV organized a Sed festival. Sed festivals were ritual rejuvenations of an aging pharaoh, which usually took place for the first time around the thirtieth year of a pharaoh's reign and every three or so years thereafter. Egyptologists only speculate as to why Amenhotep IV organized a Sed festival when he was likely still in his early twenties. Some historians see it as evidence for Amenhotep III and Amenhotep IV's coregency, and believed that Amenhotep IV's Sed festival coincided with one of his father's celebrations. Others speculate that Amenhotep IV chose to hold his festival three years after his father's death, aiming to proclaim his rule a continuation of his father's reign. Yet others believe that the festival was held to honor the Aten on whose behalf the pharaoh ruled Egypt, or, as Amenhotep III was considered to have become one with the Aten following his death, the Sed festival honored both the pharaoh and the god at the same time. It is also possible that the purpose of the ceremony was to figuratively fill Amenhotep IV with strength before his great enterprise: the introduction of the Aten cult and the founding of the new capital Akhetaten. Regardless of the celebration's aim, Egyptologists believe that during the festivities Amenhotep IV only made offerings to the Aten rather than the many gods and goddesses, as was customary.