He was born as the third oldest son of Hisataka AKIYAMA, a member of the Iyo Matsuyama clan, and Sada in Matsuyama-jo Castle town in Iyo Province (presently known as Hokomachi, Matsuyama City, Ehime Prefecture).
：伊予国松山城(伊予国)下（現・愛媛県松山市歩行町）に伊予松山藩士・秋山久敬、貞の三男として生まれる。