Emperor Guangwu of Han
The King of Na gold seal () is a solid gold seal discovered in the year 1784 on Shikanoshima Island in Fukuoka Prefecture, Japan. The seal is designated as a National Treasure of Japan. The seal is believed to have been cast in China and bestowed by Emperor Guangwu of Han upon a diplomatic official (envoy) visiting from Japan in the year 57 AD. The five Chinese characters appearing on the seal identify it as the seal of the King of Na state of Wa (Japan), vassal state of the Han Dynasty. The seal is currently in the collection of the Fukuoka City Museum in Fukuoka, Japan.