There is a description of accompanying Prince Munetaka during the pilgrimage in 1258 in the "Azuma kagami" (The Mirror of the East), and his name appears as 'Hikogoro KOKUBUN, a descendant of Goro KOKUBUN.'
正嘉2年（1258年）の随兵については、『吾妻鏡』に「国分五郎跡国分彦五郎」の名で見える。