His first appearance in "Azuma Kagami" (The Mirror of the East) was in July, 1235, in the article telling that he played a role of holding a sword during a memorial service for the shogun in the main hall when he was 25.
『吾妻鏡』の初見は嘉禄元年（1235年）6月、25歳の時に将軍の御大堂供養で剱を持する役を担っている記事に見られる。