There is a description of his 'renouncing the world' among the entries of the fourth year of Tentoku in the "Kyureki sho" ("Kyureki," in Dai-Nihon Kokiroku (Old Diaries of Japan), page 29).
『九暦抄』の天徳4年条に「御出家」（大日本古記録本『九暦』29ページ）という記載がある。