Goro KOKUBUN was in fact Tanemichi KOKUBUN who had changed his family name from Chiba to Kokubun and the Kokubun clan of Shimousa Province and Mutsu Province worshiped him as their ancestor.
国分五郎は千葉氏から国分氏に改めた国分胤通で、下総国と陸奥国の国分氏がともに祖にあおぐ。