《资治通鉴·隋纪·隋纪三》
国内地震，太子杨广请求免穿礼服，东宫的臣僚对太子不自称臣。
天下地震，太子请降章服，宫官不称臣。
There was an earthquake in the country, and Prince Yang Guang requested not to wear ritual clothes, and the minister of the East Palace did not call himself a minister to the prince.