The family was established when, in 1619, land was distributed to the Simokuze village located in the surburbs of Kyoto and owned by the Koga family, that is, when Michinori KUZE, the second son of Atsumichi KOGA, the nineteenth head of the Koga family, received this land.
久我家19代久我敦通の次男・久世通式が元和_(日本)5年（1619年）に久我家領であった京都郊外の下久世村に所領を分与されて成立する。