《资治通鉴·宋纪·宋纪五》
氐王杨难当自称大秦王，改年号为建义。封正室为王后，封世子为太子，仿照天子的制度设置文武百官。
氐王杨难当自称大秦王，改元建义，立妻为王后，世子为太子，置百官皆如天子之制，然犹贡奉宋、魏不绝。
Yang Nanddang, the King of Di, called himself the King of Great Qin and changed the reign title to Jianyi. He enfeoffed his wife as queen and his crown prince as crown prince, and imitated the system of the emperor to establish civil and military officials.