The Kutsuki were a branch of the Sasaki family hailing from Omi Province. They served as the stewards of the Kutsuki manor in that province in the Kamakura period, and the house continued through the Warring States period and into the Edo period, when some of their members became bannermen (direct vassals of the shogun) or daimyo (provincial lords). "The archives of Kutsuki family" consist of historical documents passed down in the family through the years. The Cabinet Records Bureau purchased them from the Kutsuki in 1888. Containing more than 1,060 documents, the archives were designated an important cultural property in the first year of Heisei( 1989).
Draft of a letter to Kutsuki Mototsuna written by Itakura Katsushige, Kyoto Shoshidai (local governor of Kyoto) on October 29 in the 2nd year of Genna (1616). According to the letter, abduction and trafficking of women and children have been widespread in Kyoto, and therefore Kutsuki was asked to watch for people travelling to Wakasa through his Province with women and children under 15, and investigate any suspicious persons to prevent them from passing. Related document is found in Tokugawa Bugyo toh rensho imbanjo dated April 8 in the 16th year of Keicho.