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Rerum novarum
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Leo XIII Map of Europe showing the spread of the Industrial Revolution during the 19th century, with shaded regions indicating the progression by decade from the 1840s in Britain, expanding through western and central Europe in the 1850s and 1860s, reaching eastern and southern Europe by the 1870s and 1880s. Current international boundaries are outlined. Pius IX Painting by Joseph Aubert of Saint Thomas Aquinas seated with a book, wearing a halo and black and white robes, surrounded by ornate patterns in St. Stephens Church, Jerusalem. Leo XIV
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Rerum novarum: Media

encyclical by Leo XIII
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Leo XIII
Pope Leo XIII promulgated the encyclical Rerum novarum (“Of New Things”)...
© Bettmann/Getty Images
Industrial Revolution
A map depicting the spread of the Industrial Revolution through Europe in the 19th...
Encyclopædia Britannica, Inc./Kenny Chmielewski
Pius IX
Pope Pius IX reigned as leader of the Roman Catholic Church from 1846 to 1878 and...
Felici/M. Grimoldi
St. Thomas Aquinas
Painting of scholastic philosopher St. Thomas of Aquinas by Joseph Aubert, 1900.
© Jozef Sedmak/Dreamstime.com
Leo XIV
Pope Leo XIV was elected to the papacy in May 2025. He chose Leo as his papal name...
© Alberto Pizzoli—AFP/Getty Images
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