There are arguments about the rightful successor to the Fujiwara clan: some people regard FUJIWARA no Muchimaro, Fuhito's eldest son, as the rightful successor (the Southern House of the Fujiwara clan theory), while others argue that FUJIWARA no Fusasaki, Fuhito's second son who rose to prominence earlier than his older brother, was the successor (the Northern House of the Fujiwara clan theory).
なお、藤原氏の嫡流については、不比等の長男・藤原武智麻呂を祖とする藤原南家説と兄よりも出世が早かった次男・藤原房前を祖とする藤原北家説の両説があるが、