The Nakahara clan was specialized in Myobodo (the study of Codes) and Myogyodo (the study of Confucian classics) and maintained for a long time its status as the Kanmu(a provider of official services) family for the Imperial court by inheriting positions Daigeki (senior secretary in charge of official documents) and Shogeki (junior secretary in charge of official documents).
中原氏は明法道、明経道を司る家系で、大外記、少外記を世襲職とする朝廷の官務家として長く続いた。