The origin of Dai Xianyan's ancestors in Zhangzhou

The founder of Daixianyan in Zhangzhou was an immortal who practiced in Yuanshan Mountain to save the world in the Tang Dynasty, and then sat at the gate of the temple. According to Sina blog, it is said that Kang Xian calls himself Kang Changshi. I don't know who he is. During the Tang Dynasty, he practiced in Yuanshan, collecting herbs and refining alchemy to help the world. He stayed in a temple, so he sat at the gate of the temple after his death. Dai Xianyan, commonly known as Xianzu Temple, is located in Tianzhong Village, Jiuhu, Longhai City, Zhangzhou, Fujian Province, namely Pipaban in Yuanshan Mountain. It is one of the earliest cradles of Zhengyi Taoism in Zhangzhou. In the Tang Dynasty, Taoist Kang began to preach in Pipaban, Yuanshan, Zhangzhou, to cure diseases and save lives. Dai Xianyan was founded in the Tang Dynasty and rebuilt twice in the Song Dynasty, and rebuilt in the thirty-seventh year of Qing Qianlong (1772).