Originally inhabited by a mixture of tribal groups known to the Chinese as the Baiyue ("Hundred Yue"), the region first became part of China during the Qin dynasty. Under the Qin Dynasty, Chinese administration began and along with it reliable historical records in the region. After establishing the first unified Chinese empire, the Qin expanded southwards and set up Nanhai Commandery at Panyu, near what is now part of Guangzhou. The region was an independent kingdom as Nanyue between the fall of Qin and the reign of Emperor Wu of Han. The Han dynasty administered Guangdong, Guangxi, and northern Vietnam as Jiaozhi Province; southernmost Jiaozhi Province was used as a gateway for traders from the west—as far away as the Roman Empire. Under the Wu Kingdom of the Three Kingdoms period, Guangdong was made its own province, the Guang Province, in 226 CE.