During the early Showa period, Yukimitsu MIMURODO was elected a member of the House of Peers (belonging to the group 'Kenkyukai') through mutual election; and in a dispute over the "Emperor as an organ of government Theory" started in 1935, Yukimitsu, together with another member of the House, Baron Takeo KIKUCHI (a Japanese Imperial Army soldier), questioned Tatsukichi MINOBE, the advocate of the theory, and forced him to resign from the House of Peers, and also, made the Okada Cabinet to issue the Kokutai Meicho proclamation.
三室戸敬光は昭和初期に貴族院(日本)議員（会派は研究会）に互選され、特に1935年（昭和10年）に起こったいわゆる天皇機関説問題に際して、男爵菊池武夫(陸軍軍人)議員とともに美濃部達吉を追求し辞職に追い込み、さらには国体明徴声明を岡田内閣に出させている。