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When was Hainan first incorporated into the Chinese empire?
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Hainan
Beach on Wuzhizhou Island, far southern Hainan province, China.
Hainan was formally incorporated into the Chinese empire in 110 BCE, when the Han government established two prefectures, Zhuya and Danāer, on the island.1
However, this initial incorporation was short-lived; due to constant rebellions by the indigenous Li peoples, the Chinese withdrew in the 1st century BCE. While the island remained nominally under Chinese sovereignty thereafter, effective government was not reintroduced until the Tang dynasty (618ā907 CE).1