《资治通鉴·梁纪·梁纪九》
当初，北魏因梁、益两州疆域太荒僻辽远，另行设置巴州以统领獠人，共二十余万户，任命巴州当地的酋长严始欣为刺史；又设置了隆城镇，任命严始欣的同族侄子严恺为镇将。
初，魏以梁、益二州境土荒远，更立巴州以统诸獠，凡二十馀万户，以巴酋严始欣为刺史。又立隆城镇，以始欣族子恺为镇将。
Previously, because the Liang and Yi prefectures of Bei Wei were located too far away and sparsely populated, Ba prefecture was established to govern the Liao people, there were over twenty-thousand households, and the local chieftain Yan Shi Xin was appointed as the magistrate; Longcheng town was also established, and Yan Shi Xin's nephew Yan Kai was appointed as the garrison general.