We assume that he was a minister during the reign of Empress Saimei and Emperor Tenchi on the ground that his official court rank at this time was recorded as 'Daishi' and the obituary wrote: 'the minister SOGA no Murajiko died'
このときの官位は「大紫」で「蘇我連大臣薨」と書かれていることから斉明天皇や天智天皇の下で大臣を務めていたことがわかる。