The soryo system was sustained during Kamakura period, but as heavy presence of Kamakura period disappeared, Kenmu government subdivided into south and north as well as the conflict began to rise between the legitimate child and illegitimate child as 天下三分 formed, and illegitimate child and branch family that was on the winning side started to surpassed the head family of the main line.
それでも惣領制は鎌倉時代にはともかくも維持されていたが、鎌倉幕府という重しが消滅し、建武政権が南北に分列し、更に天下三分の形勢となるに及んで、嫡子、庶子の分裂も見られるようになり、更には勝った側についた庶子・庶家（しょけ）が嫡流の宗家を凌駕する事態も訪れる。