The Sanage kilns of Owari Province had been linking to the Ritsuryo system (a system of centralized government based on the ritsuryo code), and after the 11th century, there was a change in buyers, from the ruling class to the common people class, and unglazed Yamajawan (bowl) began to be manufactured.
従来、律令体制と連動してきた尾張国の猿投窯が、11世紀以後、購買層を支配者層から庶民層へとうつし、実用的な無釉の山茶碗の生産を開始した。