These are described in "Heikoki" and there is also a description that he was delighted with the death of Tokifusa HOJO who was rensho (assistant to regents) as a curse of the Retired Emperor Gotoba, saying that 'Kanto begins to decline finally!' (in the section in February 25, 1240).
『平戸記』にもそうした記述が見られ、連署北条時房が死去した際には後鳥羽上皇の祟りであるとして「関東漸以衰微」と喜んでいる（延応2年1月24日条）。