《金史·本纪·卷一》
世祖一母同胞弟弟颇剌淑承袭了节度使之职，他是景祖的第四个儿子，就是肃宗，辽国重熙十一年出生。
母弟颇剌淑袭节度使，景祖第四子也，是为肃宗。辽重熙十一年壬午岁生。
The younger brother of Taizu, who had the same mother and father as him, followed the position of military governor, he was Jizu’s fourth son, that is, Suzong, who was born in the 11th year of the Chongxi era of the Liao Dynasty.