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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: References & Edit History

Article Contributors

Primary Contributors

  • René Ostberg
    René Ostberg is an associate editor at Encyclopaedia Britannica. 
  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Mentioned Pope Leo XIV's encyclical Magnifica humanitas. May 25, 2026
Added more information about Magnifica humanitas. May 25, 2026
Added questions and answers. Jun 05, 2025
Article thoroughly revised. May 28, 2025
Invalidated site: The Catholic Encyclopedia - Rerum Novarum. May 15, 2020
Added new Web site: The Catholic Encyclopedia - Original Text of "Rerum Novarum". Apr 26, 2007
Added new Web site: Catholic Social Teaching - Original Text of "Rerum Novarum". Apr 26, 2007
Article added to new online database. Jul 20, 1998
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