《资治通鉴·唐纪·唐纪十九》
九月，甲寅，唐朝大赦天下，更改年号，旗帜都用金色。
九月，甲寅，赦天下，改元。旗帜皆从金色。
On the day of Jia Yin in September, the Tang Dynasty granted a general amnesty and changed the reign title. The color of imperial banners was changed to golden.