When a daughter of Ujiyasu HOJO, busho (a Japanese military commander) in the Sengoku Period, was marrying Ujitomo KIRA who was an adopted son of Yoriyasu HOJO, Ujiyasu's granduncle, Genan HOJO, wrote a letter to the Ujiyasu's daughter in which he taught her in detail about family traditions and formalities of the Kira clan, daily manners and preparedness necessary for her to remain a lawful wife in the Kira family, and so on.
戦国武将北条氏康の娘が、北条頼康の養子吉良氏朝に嫁すことになった際、氏康の大叔父にあたる北条幻庵は氏康の娘に書状をしたため、吉良氏の家風や格式に関わること、吉良家の正室としての日常の作法やたしなみなどを細かく教え授けた。