《资治通鉴·唐纪·唐纪三十九》
戊寅，吐蕃军队进入长安，高晖与吐蕃大将马重英等立已故王李守礼之孙李承宏为皇帝，更改年号，设置百官，任命前翰林学士于可封等人为宰相，吐蕃军队大肆抢劫府库市里的财物，焚毁居宅，长安城中一片萧条。
戊寅，吐蕃入长安，高晖与吐蕃大将马重英等立故邠王守礼之孙广武王承宏为帝，改元，置百官，以前翰林学士于可封等为相。吐蕃剽掠府库市里，焚闾舍，长安中萧然一空。
On the day of Wuyin, the Tubo army entered Chang’an, and Gao Hui and the great Tubo general Ma Zhongying installed the deceased Prince Li Shouli’s grandson, Li Chenghong, as emperor. They changed the imperial calendar, established imperial officials, and appointed the former Hanlin Academy Scholar, Yu Kefe, and others as chancellors. The Tubo soldiers ransacked the imperial treasuries and the shops, burned down homes, and Chang’an City fell into a state of desolation.