"Shinagon" refers to the four court nobles (MINAMOTO no Toshikata, FUJIWARA no Kinto, FUJIWARA no Tadanobu, and FUJIWARA no Yukinari) who were active in the era of Emperor Ichijo in the middle Heian Period.
四納言（しなごん）とは、平安時代中期一条天皇の時代に活躍した4人の公卿（源俊賢・藤原公任・藤原斉信・藤原行成）の称。