According to "Zatsuji Yoroku" (the record of miscellaneous things), which records the financial affairs of the Konoe family in the Muromachi Period, it is recorded that in the Obanryo parcel set up within the territory of the Sessho Kanpaku (regent and chief advisor to the Emperor) family, there was a post of treasurer to collect rice for a land tax called Oban-mai, and among the officers in charge of it, there were those who did business as wholesale merchants.
また、室町時代の近衛家における経済状況を記した『雑事要録』によれば、摂関家の所領に設置されていた大番領には大番米を徴収する出納が設置され、中には問丸などの他の業種を営んでいたことが記されている。