Gosh, I love Dr. Boli. Here he talks about how governments arrange to stay in power:
The creation of public works on a massive scale was one of the expedients that occurred to early governments. Usually some problem could be found whose solution required organizing people into enormous groups of laborers, thus justifying the existence of the government that kept them organized. For example, there was the problem of disposing of dead kings. This problem alone could consume most of the resources of even a fairly advanced civilization. Since kings were divine, they could not simply be tossed in the garbage when they died; and since they were useless, they could not be recycled either. It was necessary to send the departed king off to his apotheosis with sufficient dignity that the other gods would not spend the rest of eternity mocking him. With any luck, the king might pass his entire reign supervising the construction of his own tomb, and then die just as it was completed, leaving his successor to begin an entirely new tomb, and keeping the government in business indefinitely.