《资治通鉴·唐纪·唐纪二》
下诏任命员外散骑常侍姜为秦州刺史，姜以施恩与信义怀柔地方，盗贼全都自首，百姓感到安定。
诏以员外散骑常侍姜謩为秦州刺史，謩抚以恩信，盗贼悉归首，士民安之。
An imperial edict appointed Jiang to be the governor of Qin Zhou. Jiang used kindness and trustworthiness to appease the people, and all the bandits surrendered themselves, and the people felt settled.