How the Pyramid idea came to the Pharoah's

The Pharaohs wanted a special burial place for themselves so they came up with the idea of a pyramid to protect the remains of there bodies from decaying and so they could have an afterlife. and also the pyramid would protect there belongings that they buried with them ( Like money, weapons, the book of the dead, and toys.) ( But me personally, I would rather be buried in a grave yard and decay quickly.) :]