Its first and second founder was Emon of Hokusei and Kozan Eshi (515 - 577) respectively and Chigi was Eshi's disciple (it is also said that the 1st founder was Ryuju, the 2nd was Emon, the 3rd was Eshi and the 4th was Chigi)
初祖は北斉の慧文、第二祖は衡山慧思（515年-577年）であり、慧思の弟子が智ギである（竜樹を初祖とし慧文を第二、慧思を第三、智顗を第三祖とする場合もある）。