It was customary in the samurai society during the medieval ages to have someone special become a nominal father to perform the role of placing an eboshi on a boy's head at the family's request when the boy celebrates the genpuku ceremony.
中世武家社会においては、男子が成人に達して元服を行う際に特定の人物に依頼して仮親に為って貰い、当人の頭に烏帽子を被せる役を務めることが通例とされていた。