In the early Muromachi period, sarugaku theatre absorbed acts from other performing arts (dengaku, imayoh, shirabyohshi, acrobatic dance, koutabushi, etc.) and began to transform into a form of entertainment based on the art of dance, storytelling, and imitation.
Finally, with the arrival of Kan’ami (founder of Noh theatre), sarugaku was refined and distilled into Yugen-noh (a form of Noh that was produced by discarding the comical and obscene aspects of sarugaku).
In addition, Kan’ami’s son, Zeami, created Mugen-noh.
There’s a form of Noh called Genzai-noh that features a linear story and human characters.
In Mugen-noh the stage, story and characters are about the past and proceed in a non-linear fashion.
Noh masks were also differentiated by age, class, and character in order to more effectively relate the performances.
In particular, there was a significant differentiation and development in the field of Onna masks.
This is how the prototype of Noh developed and gave us the Noh masks we know today.