Qinzong , his eldest son , was enthroned Change_of_leadership .

The Jurchens laid siege Besieging to Kaifeng in 1126 , but Qinzong negotiated Communication their retreat Escaping from the capital by agreeing Agree_or_refuse_to_act to a large annual indemnity .

Qinzong reneged on the deal Resolve_problem and ordered Arranging Song forces to defend Defending the prefectures instead of fortifying Cause_change_of_strength the capital .

They captured Conquering Emperor Qinzong of Song , many members of the imperial family and high officials of the Song imperial court in an event known as the Jingkang Incident .