Ryukyuan royal seal
- Japanese/Chinese: 琉球國王之印 (Ryûkyû kokuô no in / Liúqiú guówáng zhī yìn)
The royal seal of the Kingdom of Ryûkyû was bestowed upon the kingdom by the Chinese court as part of the Ming and Qing Dynasties' investiture of the Ryukyuan king. This was a standard element of the tributary-investiture system; seals like it were granted to all of China's major tributaries. It was used to authorize official documents, both within the kingdom, and in communications with foreign courts.
The seal was of a style known as "camel back," as it had a grip shaped like a camel's hump. Like the "camel back" seals issued to Vietnam, Siam, Java, and certain other kingdoms, it was made of gilded silver. This was in contrast to the seals bestowed upon the kings of Joseon dynasty Korea and the Muromachi shoguns (as "king of Japan"), which were solid gold, with grips in the shape of turtles.
- David C. Kang, “Hierarchy in Asian International Relations: 1300-1900.” Asian Security 1, no. 1 (2005): 62.; Anthony Reid, "Introduction," in Reid & Zheng Yangwen (eds.), Negotiating Asymmetry: China's Place in Asia (NUS Press, 2009), 13-14.
- Akamine Mamoru, Lina Terrell (trans.), Robert Huey (ed.), The Ryukyu Kingdom: Cornerstone of East Asia, University of Hawaii Press (2017), 128.
- Angela Schottenhammer, “Empire and Periphery? The Qing Empire’s Relations with Japan and the Ryūkyūs (1644–c. 1800), a Comparison.” The Medieval History Journal 16, no. 1 (April 1, 2013): 176-179.