《旧唐书·列传·卷十三》
太宗登位，改任萧瑀为尚书左仆射，封伦为尚书右仆射。
太宗即位，迁尚书左仆射，封伦为右仆射。
When Taizong ascended to the throne, he transferred Xiao Yu to serve as minister of the left servant and Feng Lun as minister of the right servant.