On the other hand, there was the Crown Prince, the Emperor Kazan, who was born by FUJIWARA no Kaishi, who was his elder sister and a nyogo (empress) of the Emperor Reizei and he, as being a rare maternal relative to the emperor, assumed the position of togu no suke (assistant master in the Crown Prince's palace).
ただ、姉の冷泉天皇女御藤原懐子が生んだ皇太子花山天皇がおり、その数少ない外戚として春宮亮の任にあった。