In 1123, assuming the post of Tendai-zasu (the head priest of the Tendai sect) at the youthful age of 33, Ninjitsu was the first case of anyone assuming the post younger than the age of 40.
1123年（保安(元号)4年）33歳の若さで天台座主に就任したが、これは40歳未満の天台座主就任の初例とされる。