Through three generations of Nobuhira KOBAYAKAWA, Sadahira KOBAYAKAWA and Haruhira KOBAYAKAWA, the clan advanced to the Geiyo Islands and formed the basis for the Kobayakawa Navy.
その後、小早川宣平、小早川貞平、小早川春平　の三代の間に芸予諸島に進出し、小早川水軍の基礎を築く。