However, Tadanobu never became a minister, in contrast to FUJIWARA no Yorimichi and his brother Norimichi, who became ministers when they were still young, and Sanesuke, who enjoyed exceptional longevity for that time.
だが、若くして大臣となった藤原頼通・教通兄弟及び当時としては稀に見る長命を保った実資の3大臣を前に遂に斉信が大臣になることはなかった。