《辽史·本纪·卷二十四》
初七，任命萧挞不也为北府宰相，耶律世迁为知北院枢密使事，耶律慎思为同知北院枢密使事。
乙丑，以萧挞不也为北府宰相，耶律世迁知北院枢密使事，耶律慎思同知北院枢密使事。
On the seventh day, Xiao Dabuy was appointed as the Prime Minister of the North Palace, Yelü Shiqian as the Privy Councilor of the North Palace, and Yelü Shenshi as the Assistant Privy Councilor of the North Palace.