Many of the recent headlines about a new tomb discovery at Palenque are a bit misleading, to say the least. The painted tomb within Temple XX was first found and remotely photographed in 1999 by the PARI Proyecto de las Cruces Project, led by the late great Merle Greene Robertson. The recent small press frenzy was prompted by an post from INAH Noticias announcing the lowering of a video camera into the sealed chamber.
It will be very interesting to learn more about the tomb’s contents and occupant once the chamber is opened and carefully documented (that occasion will be newsworthy). As I mention in our book Palenque: Eternal City of the Maya, there’s some circumstantial evidence that it dates to the middle years of the dynastic history, not quite so early as some have said. I believe Merle also thought such date a date, in the sixth century, was also most likely. The painted figures on the walls of the tomb are in a very curious and unusual style, but iconographically they are very similar to the ancestors depicted in stucco relief in the far more famous tomb of K’inich Janab Pakal.
A few on-line resources on the Temple XX tomb, long available: