Archaeological site in Puyang, Henan province in central China, revealed that the place was once used as an ancient Chinese city called Gan. Among the items discovered were chess pieces and a set of 10 polished and painted bone pieces.
Archaeologist Kew Pollin said the tombs "were probably built during the Khan period, especially the Western Khan dynasty (206 BC-25 AD)," based on their long, narrow configuration and the fact that they were found alongside numerous pottery and bronze remains.