To obtain the Mikawa Governor post, it was customary at that time to hold a rank of equivalent to a Jugoinoge (Junior Fifth Rank, Lower Grade) however, there were rigid hereditary family line limitations to who was awarded Jugoinoge rank.
三河守受領の為の位階は従五位下に相当するが、当時の慣例では、従五位下の位階を与えられる姓の系統は限られていた。