What we can know from Yazhou Old Town Sanya Hainan Island: It was said that Ancient Yazhou Wall was built with mixed earth & grass as first, in the year 1198 of Nan Song Dynasty (1127-1297), local people started to build the walls with bricks. Yanzhou had been an economic & a political center of south Hainan from Qin Dynasty (BC221-BC206) until October 1954 when the administrative center was moved to Sanya, a fishing village. From Song Dynasty onward (960-1279), many famous politicians, writers were exiled from Mainland China. In Tang Dynasty (618-907), the famous monk Jian Zhen intended to visit Japan 5 times by boat but failed. At the 5th time, his group was stopped by the typhoon and then they drifted to Ningyuan River near Yazhou. During his stay in Yazhou, he helped local people to rebuild Dayuan Temple and left a lot of Buddhist scriptures. At the end of Song Dynasty (960-1279), the famous Female textiler Huang Daopo moved to Shuinan Village in Yanzhou and stayed for nearly 30 years. She learned textile technology from the local people. She went back to her hometown Wunijing Town (now Huajing Town of Shanghai) and taught her textile technology to her fellows. So Huangdaopo is respected as the ancestor of the textile industry.