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.
Treaty of Verdun
In 855, the northern section became fragile Lotharingia, which became disputed by the more powerful states that evolved out of West Francia (i.e., France) and East Francia (i.e., Germany). Generations of kings of France and Germany were unable to establish a firm rule over Lothair's kingdom. While the north of Lotharingia was then composed of independent countries, the southern third of Lotharingia, Alsace-Lorraine, was traded back and forth between France and Germany from the 18th to the 20th century. In 1766, it passed to France after the death of Stanislaw Leszcyznski, who had acquired the region from the German Habsburgs by the Treaty of Vienna (1738) ending the War of Polish Succession (1733-1738). In 1871, Alsace-Lorraine became German, after the victory of Prussia and its German allies over the French in the Franco-Prussian War (1870-1871). In 1919, it became French again by the Treaty of Versailles (1919), following the French victory over the Germans in World War I (1914-1918). In 1940, Germany reannexed Alsace-Lorraine following Germany's successful invasion of France. Finally, in 1945, after World War II (1939-1945), Alsace-Lorraine was solidified as French territory, which it remains to this day, more than a thousand years after the Treaty of Verdun. The collapse of the Middle Frankish Kingdom also compounded the disunity of the Italian Peninsula, which persisted into the 19th century.