Except for "Futsu-shodo shu," as mentioned in 'The Writing Process,' there is only an article dated April 16, 1321 (according to the lunar calendar) of "Hanazono-in Shinki" by Emperor Hanazono, which says that 'Heiji, Heike and others' were told by Biwa-hoshi.
すでに「成立」でふれた『普通唱導集』を除けば、花園天皇の手になる『花園院宸記』の元亨元年（1321年）4月16日(旧暦)の記事に「平治・平家等」の琵琶語りがおこなわれたとあるのを挙げ得る程度である。