His name only appears in the 'Taira sei KOKUBUN shi Keizu' (The genealogy of the Kokubun family of Taira clan) that was compiled by Yoshikazu SAKUMA in the Edo period.
重胤の名は、江戸時代に佐久間義和が編纂した「平姓国分氏系図」にのみ現れる。