Under the Sun Temple there is a small, interesting cave known as the Royal Tomb. The cave is roofed by an enormous sloping slab of stone which supports part of the Sun Temple. This was the place where the mummies of the Inca's ancestors and the high imperial dignitaries were kept, worshipped and offered tributes.
Although it was thus named by Bingham, who thought that it had contained the mummy of a Cusco noble or possibly of an Inca, he wrote that nothing was found in the tomb. This is another contradiction of his since, why should he then suppose it had been a tomb?

The logical thing would be for the Inca to be buried under his father's temple. No doubt, the small cave was connected with Ukju Pacha (the underworld) and the cult of the dead. On the side wall there are two large, trapeze-shaped niches with stone beams, and two small niches on the back wall. On the ground there is a carving representing the three levels of the Andean Religious World. In Inca society all corpses were mummified in a fetal position, with the only difference that nobles' mummies were kept in the temples, whereas those of ordinary people were buried or kept in cemeteries.