When Did the Pharaohs Start Being Buried in the Valley of the Kings?

When did the pharaohs start being buried in the valley of the kings? Well, they start off by being buried er in brick tombs. And then they progress to pyramid building - which goes on for a long time. The pyramids are huge, but they're very, very labouring tens. If you need many, many thousands of people to build a pyramid, yes, it's impressive, but it's also a massive sign post to where the king is buried.