Song sends envoys to the Jurchens

Timeline

1. 1111–1118Kaifeng (Northern Song capital) · Northern SongIn Zhenghe 1 (1111), Liao defector Ma Zhi (later granted the name Zhao Liangsi) proposed to Emperor Huizong a plan to ally with Jin and destroy Liao, suggesting maritime contact from Deng and Lai to attack Liao jointly. In Zhenghe 8 (1118), the Song court adopted this plan and sent Ma Zheng and others by sea from Dengzhou to Jin, opening direct Song-Jin contact.
2. 1120Jurchen homeland (around the Achu River) · JurchensIn Xuanhe 2 (1120), Huizong sent Zhao Liangsi, Wang Gui, and others to Jin, meeting Wanyan Aguda near the Jin capital Huining Prefecture, and agreed on a joint attack: Jin would take Liao's Central Capital and elsewhere, Song would take Liao's Southern Capital (Yanjing); afterwards Yan and Yun would go to Song and Song's annual tribute would be transferred to Jin, known as the Alliance of the Sea.