In "Gikeiki" (a military epic about the life of Yoshitsune) written in the early Muromachi period, Tadanobu was described as one of the main characters who commit a fierce suicide after the brave fight in Kyoto where he was back alone from Yoshino as being Yoshitsune's undercover. 
室町時代初期に書かれた『義経記』での忠信は、義経の囮となって吉野から一人都に戻って奮戦し、壮絶な自害をする主要人物の一人となっている。