"Azuma Kagami," a history book of the Kamakura period, writes 'and Benkei squired' in its description dated December 3, 1185 and 'Only four retainers squired Yoshitsune. They were Izu Uemon-no-jo, Yataro HORI, Musashibo Benkei and...' in its description dated December 6, 1185; almost no other facts other than these are known about his life.
『吾妻鏡』には文治元年（1185年）11月3日(旧暦)に「辨慶法師已下相從」11月6日(旧暦)に「相從豫州之輩纔四人所謂伊豆右衛門尉堀弥太郎武藏房辨慶」と記されているだけで、その生涯についてはほとんど判らない。