He was held in confinement by Retired Emperor Gotoba during the Jokyu War, but managed to alert the bakufu of what was happening in advance, and thereby contributed to the bakufu's eventual victory.
承久の乱の際には後鳥羽上皇によって幽閉されるが、事前に乱の情報を幕府に知らせ幕府の勝利に貢献した。