Ra

It appeared in the sky again and they celebrated.
They toiled all day as it shone down on them, taking minimal breaks for food, drink and evacuation.
Eventually it disappeared. They were sad and stopped working.
They slept.
The next day it appeared in the sky.
The cycle continued until one day they'd had enough. They were treated like slaves and they weren't going to stand for it anymore.
They formed a union. There would be no more pyramids after the third, they said.