《宋史·本纪·卷二十三》
靖康二年春正月初一，命令济王赵栩、景王枷巳出城祝贺金军新春，金军也派人来祝贺新春。
二年春正月辛卯朔，命济王栩、景王杞出贺金军，金人亦遣使入贺。
On the first day of the first month of the spring of the second year of Jingkang, King Ji of Zhao and King Jing were ordered to leave the city to congratulate the Jurchen army on the New Year, and the Jurchen army also sent people to congratulate them on the New Year.