According to the story handed down to the Ko family, the family served Emperor Gohanazono as Hokumen no bushi (the Imperial Palace Guards for the north side), and later Masatada KO became a tsure (an associate actor) in the Konparu school of Noh under the name of 'Uji Ko dayu,' but in fact, it is said that an actor of Sarugaku (a form of theater) troupe in Uji joined the Konparu troupe as a tsure and hayashikata (people who play hayashi, or the musical accompaniment) after he lost his influence.
家伝によれば、幸家はもと北面の武士として後花園天皇に仕え、後に幸正忠が「宇治幸大夫」と名のって金春流のツレとなったと伝えるが、本来は宇治市猿楽の大夫であった者が、後に勢力を失って金春座にツレ・囃子方などとして参加したものであるらしい。