It was around the beginning of Muromachi period that the system of giving yakata-go title was established, when the title was allowed to Ashikaga clans and other predominant Shugo daimyo (Japanese territorial lords as provincial constable) and Shugodai (deputies of Shugo, provincial constables) as well as to Kokujin (local samurai) who were credited with their contribution to the establishment of Muromachi bakufu and punitive expedition of rebellion.
屋形号が成立したのは室町時代初期の頃であり、足利氏の一門や有力な守護大名、守護代、主に室町幕府の成立や謀反人討伐に功ある国人に許された。