《新唐书·列传·卷一百四十六》
乾元三年，皇帝委任其弟左监门卫率叶护尉迟曜为大仆员外卿、同四镇节度副使，代理本国政事。
乾元三年，以其弟左监门卫率叶护曜为大仆员外卿、同四镇节度副使，权知本国事。
In the third year of the Qianyuan era, the emperor appointed his younger brother, Yuchi Yao, commandant of the Left Ward of the Gate Guards, as grand minister and assistant military commissioner for the Four Protectorates, to handle the affairs of the kingdom in his absence.