Pope Pius X (Ecclesiastical Latin: Pius PP. X) (2 June 1835 – 20 August 1914), born Giuseppe Melchiorre Sarto, was the 257th Pope of the Catholic Church, serving from 1903 to 1914. He was the first pope since Pope Pius V to be canonized. Pius X rejected modernist interpretations of Catholic doctrine, promoting traditional devotional practices and orthodox theology. His most important reform was to publish the first Code of Canon Law, which collected the laws of the Church into one volume for the first time. He was a pastoral pope, encouraging personal piety and a lifestyle reflecting Christian values. He was born in the town of Riese, which would later append "Pio X" (Pius X's name in Italian) to the town's name.

Pius was particularly devoted to Mary; his encyclical Ad Diem Illum expresses his desire through Mary to renew all things in Christ, which he had defined as his motto in his first encyclical. Pius believed that there is no surer or more direct road than by the Virgin Mary to achieve this goal. Pius X was the only Pope in the 20th century with extensive pastoral experience at the parish level,^{[citation needed]} and pastoral concerns permeated his papacy; he favoured the use of the vernacular in catechesis. Frequent communion was a lasting innovation of his papacy. Pius X, like Pope Pius IX, was considered by some^[who?] to be too outspoken or brusque. His direct style and condemnations did not gain him much support in the aristocratic societies of pre–World War I Europe.

Pope Pius XI (Latin: Pius PP. XI; Italian: Pio XI; 31 May 1857 – 10 February 1939), born Ambrogio Damiano Achille Ratti, was Pope from 6 February 1922, and sovereign of Vatican City from its creation as an independent state on 11 February 1929 until his death on 10 February 1939. He issued numerous encyclicals including Quadragesimo Anno, highlighting capitalistic greed of international finance, and social justice issues, and Quas Primas, establishing the feast of Christ the King. He took as his papal motto, "Christ's peace in Christ's kingdom".

Achille Ratti was an accomplished scholar, librarian and priest. He celebrated his 60th birthday as a priest on 31 May 1917. Fewer than five years later, on 6 February 1922, he was elected Pope, succeeding Pope Benedict XV, who was only thirty months older and thus from the same generation as Ratti. In those five years, he had short stints as papal nuncio in Poland, which forced him to leave the country, and as Archbishop of Milan and Cardinal-Priest of Ss. Silvestro e Martino ai Monti, where he served for a few months before being elected Pope. He chose the name Pius, and his personality was strong, similar to Pius IX and Pius X. But as a scholar, he was open to science and research like no other Pope since Leo XIII.

Guglielmo Marconi (Italian pronunciation: [ɡuʎˈʎɛːlmo marˈkoːni]; 25 April 1874 – 20 July 1937) was an Italian inventor, known as the father of long distance radio transmission and for his development of Marconi's law and a radio telegraph system. Marconi is often credited as the inventor of radio, and indeed he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy". Much of Marconi's work in radio transmission was built upon previous experimentation and the commercial exploitation of ideas by others such as Hertz, Maxwell, Faraday, Popov, Lodge, Fessenden, Stone, Bose, and Tesla. As an entrepreneur, businessman, and founder of the The Wireless Telegraph & Signal Company in 1897, Marconi succeeded in making a commercial success of radio by innovating and building on the work of previous experimenters and physicists. In 1924, he was ennobled as Marchese Marconi.

Marconi was born in Bologna on April 25, 1874, the second son of Giuseppe Marconi, an Italian landowner, and his Irish wife, Annie Jameson, daughter of Andrew Jameson of Daphne Castle in the County Wexford, Ireland and granddaughter of John Jameson, founder of whiskey distillers Jameson & Sons. Marconi was educated privately in Bologna in the lab of Augusto Righi, in Florence at the Istituto Cavallero and, later, in Livorno. As a child Marconi did not do well in school.Baptized as a Catholic, he was also a member of the Anglican Church, being married into it; however, he still received a Catholic annulment.

David I. Kertzer is Paul Dupee, Jr. University Professor of Social Science, Professor of Anthropology (1992– ), Professor of History (1992–2001), and Professor of Italian Studies (2001-) at Brown University. He was Provost of Brown from July 1, 2006 to June 30, 2011. In 2005 he was elected a member of the American Academy of Arts and Sciences.

He is the author of numerous books and articles on politics and culture, European social history, anthropological demography, 19th century Italian social history, contemporary Italian society and politics, and the history of Vatican relations with the Jews and the Italian state. His book, The Kidnapping of Edgardo Mortara, was a finalist for the National Book Award in Nonfiction in 1997. His 2001 book, The Popes Against the Jews, has been published in nine languages.

Benito Amilcare Andrea Mussolini (Italian pronunciation: [beˈniːto musːoˈliːni]; 29 July 1883 – 28 April 1945) was an Italian politician who led the National Fascist Party, ruling the country from 1922 to his ousting in 1943, and is credited with being one of the key figures in the creation of fascism.

Originally a member of the Italian Socialist Party and editor of the Avanti! from 1912 to 1914, Mussolini fought in World War I as an ardent nationalist and created the Fasci di Combattimento in 1919, catalyzing his nationalist and socialist beliefs in the Fascist Manifesto, published in 1921. Following the March on Rome in October 1922 he became the 27th Prime Minister of Italy and began using the title Il Duce by 1925, about which time he had established dictatorial authority by both legal and extraordinary means, aspiring to create a totalitarian state. After 1936, his official title was Sua Eccellenza Benito Mussolini, Capo del Governo, Duce del Fascismo e Fondatore dell'Impero ("His Excellency Benito Mussolini, Head of Government, Duce of Fascism, and Founder of the Empire") Mussolini also created and held the supreme military rank of First Marshal of the Empire along with King Victor Emmanuel III, which gave him and the King joint supreme control over the military of Italy. Mussolini remained in power until he was replaced in 1943; for a short period after this until his death, he was the leader of the Italian Social Republic.