Although his father was a grandchild of the Emperor Heizei, Muneyana's official court rank was not high and it remained Jugoinojo Chikuzen no kuni no Kami (Junior Fifth Rank, Upper Grade, an officer in charge of regional administration in Chikuzen).
平城天皇の孫である在原業平の子であるが、官位に恵まれず従五位上筑前国守にとどまる。