 A bounty of 2,000 silver marks was placed on the head of the lead conspirator, Frederick I of Isenberg, and his castles were besieged and captured.After travelling to Rome to have his excommunication lifted, Frederick was captured in Liège and sold to Cologne, where he was executed on 14 November 1226 at the Severin Gate.Heinrich continued the policy of his predecessors to increase the power and territories of the archbishopric.