Saiko joined a conspiracy by FUJIWARA no Narichika, Shunkan, and Yukitsuna TADA to beat the Taira clan, and became the mastermind of the closed discussion at the lodge in Shishigatani (the Shishigatani plot).
西光は藤原成親・俊寛・多田行綱らの平氏打倒の陰謀に加わり、鹿ヶ谷の山荘での密議の首謀者となる（鹿ケ谷の陰謀）。