《隋书·列传·卷五十》
赵行枢是乐师的儿子，家产巨万，以前交好宇文智及。勋侍杨士览，是宇文家的外甥，二人一起报告智及。
赵行枢者，乐人之子，家产巨万，先交智及，勋侍杨士览者，宇文甥，二人同告智及。
Zhao Xingshu was the son of a musician, who had a huge fortune, and had befriended Yuwen Zhiji in the past. The attendant Yang Shilan was Yuwen's nephew, and the two reported to Zhiji together.