It was here that the emperor signed the edict abolishing the shogunate and sent his carpenters round the castle to replace the Tokugawa hollyhock crest with the imperial chrysanthemum.
The crest needed replacing as it had burned down in a small fire.
mnli hypothesis: The crest needed replacing as it had burned down in a small fire. premise: It was here that the emperor signed the edict abolishing the shogunate and sent his carpenters round the castle to replace the Tokugawa hollyhock crest with the imperial chrysanthemum.