According to "Gikeiki" (a military epic about the life of Yoshitsune), which is said to have been written in the early Muromachi Period, Yoshitsune's Kitanokata (wife) was a princess of the Kuga family, the family controlling Todo-za (the traditional guild for the blind), to which the blind biwa-playing minstrels were belonging, during that period.
室町時代初期に成立したとされる『義経記』では、その時代に盲目の琵琶法師らが属する当道座を支配していた久我家の姫を義経の北の方としている。