At the Muromachi bakufu, there was a ceremony where prominent Shugo daimyo (Japanese territorial lord as provincial constable) family heads (toryo) served oban to the shogun and ate together, and the date to serve oban at the shogun's place was chosen for each Daimyo family.
室町幕府においては、有力守護大名家の家督（棟梁）が将軍に椀飯を奉って会食を行う儀式となり、大名家ごとに将軍の元に出向いて椀飯を奉る日付が定められた。