Since FUJIWARA no Kanemichi, who was Kanpaku Daijo Daijin (the Chief Adviser to the Emperor) at that time, had to oppose to his younger brother, Dainagon (chief councilor of state), FUJIWARA no Kaneie, Kanemichi needed to have Udaijin (Minister of the right), FUJIWARA no Yoritada (Kanemichi's male cousin) on his side, since he was in a strong position to be able to compete against both Kanemichi and Kaneie within the Fujiwara.
これは、当時関白太政大臣であった藤原兼通が実弟である大納言藤原兼家と対抗するために、当時の藤原氏内部において兼通・兼家双方と対抗出来る立場にあった右大臣藤原頼忠（兼通の従兄弟）を味方につける必要性があった。