Chen Yuan
The main branches of the Yuan clan after the Han Dynasty were all in north China, most of them in population centres near the Yellow River. In the 3rd century members of the Chen Yuan are known to have moved as far south as the Red River delta in modern Vietnam. Early migrations south established Yuan clans along the lower Yangtze River, in Danyang, Lujiang, Wuxi, Yangzhou and Nanjing. Records from the Tang Dynasty name three major Yuan clans, in Ru'nan, Pengcheng and Yichun.