《资治通鉴·唐纪·唐纪一》
于是相互联络，内史舍人元敏、虎牙郎将赵行枢、鹰扬郎将孟秉、符玺郎牛方裕、直长许弘仁、薛世良、城门郎唐奉义、医正张恺、勋侍杨士览等人都参与同谋，日夜联系，在大庭广众之下公开商议逃跑的事，毫无顾忌。
因转相招引，内史舍人元敏、虎牙郎将赵行枢、鹰扬郎将孟秉、符玺郎李覆、牛方裕、直长许弘仁、薛世良、城门郎唐奉义、医正张恺、勋士杨士览等皆与之同谋，日夜相结约，于广座明论叛计，无所畏避。
Thus they worked together to contact people, the Interior History Registrar Yuan Min, the Tiger Tooth Lang-General Zhao Xingshu, the Yingyang Lang-General Meng Bing, the Fu Xi Lang Niu Fangyu, the Zhizhang Xu Hongren, Xue Shliang, the City-Gate Lang Tang Fengyi, the Medical Inspector Zhang Kai, the Honorary Attendant Yang Shilan and some others all participated in the plot, they contacted each other day and night, and discussed their plans to escape in open and public places, completely without any inhibitions.