Polish and Peruvian archaeologists have discovered in Peru a royal burial chamber with 60 mummies and some 1,200 gold, silver and ceramic objects from more than 1,000 years ago.

The mummies — including three princesses — date back to a pre-Incan people called the Wari, who peaked between the seventh and 11th centuries, researchers said.

“This is the first Peruvian discovery of a royal tomb from the Wari culture,” said archaeologist Giersz Milosz of the University of Warsaw.

The chamber was discovered six feet underground and covered with 33 tons of gravel.