Once upon a time there was an egg floating in the water. When that egg hatched Ra was born.
Ra didn't want to float around in the water forever, so he became the sun and dried almost everything up.
Ra created many gods, but the most important ones were Set, Isis, and his brother Osiris. When Osiris became pharaoh and married Isis Set was furios.
A few years after Osiris became pharaoh Set chopped him into pieces. When Isis heard about this she instantly brought the pieces to her good friend Anubis who put him back together. Sadly he could not bring him back to life.
When Ra heard about this he was furious. Since he was dead he crowned him God of death. Cincedering the only way to get into the realm of the dead is to be dead.
After Osiris died Isis would go to the river and cry. When she cried the Nile River will rise.