When Princeton University purchased five oaths (kishōmon) from a Japanese antique bookseller in 2017, little was known about their origin except that the bookseller had obtained them from the collection of Takita Eiji (1904-1998), an entrepreneur and a local historian from Aichi prefecture who had studied Zen Buddhism and Japanese History at the University of Tokyo. It is now known that these documents were part of a collection of documents handed down to the Saji, a warrior family based in Kōga district, in Ōmi province (nowadays Kōka city, Shiga prefecture).

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