However, partly because the Yoshida-jinja Shrine was the ujigami (guardian deity) of the Fujiwara clan, the power of two branches were equal and the position of uji no choja (clan head) was inherited by both branches in turns and both branches respectively studied old books such as Nihonshoki as the kagaku (study by the family).
しかし、吉田神社が藤原氏の氏神であることもあり勢力は二分され、氏長者も二流が交替で受け継ぎ、それぞれ家学として日本書紀等の古典の研究をしていた。