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 "The archives of Kutsuki family" consist of historical documents passed down in the family through the years.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).
Document written by Ashikaga Naoyoshi (1306 - 1352, younger brother of Ashikaga Takauji) dated May 3 of 2nd year of Ryakuo era (1339) to Sasaki Dewashirobei (Kutsuki Yoriuji) to fight at Kanegasaki of Echizen Province (present day Tsuruga City, Fukui Prefecture) together with Sasaki Goro (Kyogoku Takahide) of Omi Province and estate stewards and vassals of Asai, Ika and Sakata counties as partisan of Southern Dynasty.