President of the Chamber of Deputies of the Second Parliament (from 10 May 1955 to 11 June 1958), of the Third Parliament (from 12 June 1958 to 15 May 1963), and of the Fourth Parliament (from 16 May 1963 to 21 June 1963). Elected to the Constituent Assembly, he was a member of the "Committee of the Seventy-five" that wrote the main text of the Constitution. Appointed President of the Chamber of Deputies on 10 May 1955 in the middle of the Second Parliament to replace Gronchi, Leone retained his post in the Third and Fourth Parliaments, though he stepped down from the latter a few months after being re-elected President of the Council of Ministers. Since Italy became a Republic, he is the only President of the Chamber to have also held the positions of Prime Minister and President.