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 "The archives of Kutsuki family" consist of historical documents passed down in the family through the years.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).
Mikyosho (message) of Ashikaga Yoshiakira (1330-67, the 2nd shogun of the Muromachi Bakufu and son of Ashikaga Takauji), dated June 3 in the 2nd year of Joji, giving permission to Sasaki Dewa Goro (Kutsuki Ujitsuna) to succeed the domain as written in the deed of transfer by his father Tsuneuji who passed away on intercalary October 4 in the 3rd year of Bunna(wa) (1354). Mikyosho is a document issued by a vassal of court nobles of the third rank and higher or Shogun, in a format of Hosho(a document used for informing a decision of the upper ranked personages), upon direct orders from the nobles or Shogun.