This kind of custom had existed since ancient times, and then, in the Kamakura period, a party to a suit often invited those in charge of the case to a drinking party to receive a favorable sentence.
こうした慣習は古代から存在したが、鎌倉時代には訴訟当事者が有利な判決を得るために担当者を宴会に招く事がしばしば行われていた。