King of Na gold seal
The King of Na gold seal (Japanese: 漢委奴国王印) is a Chinese seal made of solid gold designated as a National Treasure of Japan, discovered in 1784 on Shikanoshima Island in Fukuoka Prefecture, Kyushu, southern Japan. The seal is believed to have been cast during Eastern Han dynasty and bestowed by Emperor Guangwu upon a diplomatic envoy visiting from the Yayoi Na state in the year 57 AD, as an official authentication of the state as a tributary state of China.