Taiwan Province Province was called Ryukyu in the Tang Dynasty, and the Ryukyu Islands located here were also called Little Ryukyu. Taiwan Province Province is the territory of China, while Ryukyu is a subordinate country of China. Ryukyu has been a dependency of China for more than 500 years. The concept of vassal state, that is, the western "vassal state", is different from the modern western "colonial" colonies, but it is similar to the agricultural civilization in medieval Europe and the concept of "vassal state" during the Austro-Hungarian Empire or "state within a country" under the papacy in the Middle Ages, and is regarded as a country in western principles.