But the list is long. There is evidence of cannibalism by Neanderthals on Neanderthals, as well as humans devouring Neanderthals. In Gow's Cave in England, remains of defleshed bones date back 15,000 years, with evidence that human skulls were being used as drinking vessels. But again, the list continues. The tomb of the Egyptian King Unas contained a hymn in praise to the king as a cannibal. Cannibalism was routine in Roman sieges, the Crusades, as well as in China during the Tang dynasty, where cannibalism included eating an enemy's heart and liver as punishment. Now many attribute cannibalistic rituals to the Mesoamericans.