Lateran Treaty
Negotiations for the settlement of the Roman Question began in 1926 between the government of Italy and the Holy See, and culminated in the agreements of the Lateran Pacts, signed—the Treaty says—for King Victor Emmanuel III of Italy by Benito Mussolini, Prime Minister and Head of Government, and for Pope Pius XI by Pietro Gasparri, Cardinal Secretary of State, on 11 February 1929. It was ratified on 7 June 1929. The agreements were signed in the Lateran Palace, hence the name by which they are known.
Francesco Pacelli
Francesco Pacelli was dean of the lawyers of the Rota and legal advisor to Pope Pius XI. In this role, he was instrumental in negotiating this Lateran Treaty in 1929, which reaffirmed the independence of the Papacy with the formation of Vatican City as a sovereign entity. Francesco Pacelli described in his "Diario della Conciliazione " details and difficulties of these negotiations from a Vatican perspective. Pope Pius XI and Pietro Gasparri had entrusted to him the daily negotiations for the Lateran Treaty. Pacelli had over two-hundred protracted audiences with Pius XI over twenty different draft versions of the final treaty.