Venerable Yon Seng Yeath, chancellor of Preah Sihanouk Raja Buddhist University and head of Phnom Penh’s Wat Ounalom, has joined with Buddhist conservatives around the world to protest an upcoming auction by Sotheby’s Hong Kong. The May 7 auction will see more than 300 sacred Buddhist relics go under the hammer.

A finished skeleton of a Gorgosaurus dinosaur that roamed the earth 77 million years ago was sold for $6.1 million at Sotheby’s in New York on Thursday, making it one of the most valuable dinosaur skeletons ever sold at auction.