Akhetanen, a.k.a. Echnaton implemented exclusive worship of the sun god Aton, the ancient cults were basically banned. The capital of Egypt was moved to Amarna, which was a newly built city somewhere in the desert. The cult required huge amounts of food (fruits, meat and other) to be delivered to the sun god by putting them on altars and exposing them to the sun and heat. Which didn’t positively contribute to the popularity of the cult among the people, as of course the best food was to be sacrificed. After Enchatons death, probably by assassination, the Aton cult ceased, Amarna was abandoned and the old gods where worshipped again. To show this, his son, pharao Tutankhaton changed his name to Tutankhamun (different spellings exist for both names).