Wikipedia says:
Tutankhamun seems to have faded from public consciousness in Ancient Egypt within a short time after his death, and remained virtually unknown until the 1920s. His tomb was robbed at least twice in antiquity, but based on the items taken (including perishable oils and perfumes) and the evidence of restoration of the tomb after the intrusions, it seems clear that these robberies took place within several months at most of the initial burial. Eventually the location of the tomb was lost because it had come to be buried by stone chips from subsequent tombs, either dumped there or washed there by floods. In the years that followed, some huts for workers were built over the tomb entrance, clearly not knowing what lay beneath. When at the end of the 20th Dynasty the Valley of the Kings burials were systematically dismantled, the burial of Tutankhamun was overlooked, presumably because knowledge of it had been lost and his name may have been forgotten.
It was the “most famous” reference that I was asking about. I have watched the History channel every time King Tut has been featured. He died so young it must be the amount of artifacts that makes him famous, not something he did.