《旧唐书·列传·卷三十九》
武则天将去嵩山封禅，命姚璹总管仪礼，充封禅副使。
天后将封嵩岳，命璹总知撰仪注，并充封禅副使。
Wu Zetian was about to carry out the fengshan ceremony in Songshan, and appointed Yao Xu as the chief administrator of the ceremony, and deputy to the envoy who would perform the fengshan ceremony.