After the mid-Heian era, amid the political decline of the Southern House due to the expanding power of the Northern House, the descendant of FUJIWARA no Kosemaro, who was the fourth son of Muchimaro, survived as the central nobility and many of the descendants became scholars.
平安時代中期以後は、藤原北家に押され政治的に衰退する中、武智麻呂の四男藤原巨勢麻呂の子孫が中央貴族として続き、多くの学者を輩出した。