Rerum novarum
encyclical issued by Pope Leo XIII on May 15, 1891
Rerum novarum is an encyclical issued by Pope Leo XIII on 15 May 1891. It is an open letter passed to all Catholic bishops addressing the condition of the working class. It discusses the relationships and mutual duties between labor and capital, as well as between government and its citizens. Of primary concern is the need to alleviate the poverty of the working class. The encyclical attempts to strike a just balance among the rights of workers, owners, and the state, supporting the rights of labor to form trade unions and earn a living wage, balanced with the right to private property, while rejecting the extremes of state socialism and laissez-faire capitalism.
A foundational text of modern Catholic social teaching, many of the positions in Rerum novarum are supplemented by later encyclicals, in particular Pius XI's Quadragesimo anno (1931), John XXIII's Mater et magistra (1961), Paul VI's Octogesima adveniens (1971), John Paul II's Centesimus annus (1991), and Leo XIV's Magnifica humanitas (2026), each commemorating an anniversary of Rerum novarum.
The encyclical also inspired Catholic activism and influenced the development of both distributism and corporatism. Socialists generally contest the encyclical's interpretation of socialism; Catholic socialists in particular, interpreting Rerum novarum as not rejecting socialism, argue that divine law justifies the abolition of private property and emphasize the encyclical's anti-capitalist character.
Composition
The first draft and content of the encyclical was written by Tommaso Maria Zigliara, professor from 1870 to 1879 at the College of Saint Thomas (rector after 1873), a member of seven Roman congregations including the Congregation for Studies, and co-founder of the Pontifical Academy of Saint Thomas Aquinas in 1879. Zigliara's fame as a scholar at the forefront of the Thomist revival was widespread in Rome and elsewhere.
The public source identifies “Rerum novarum” as encyclical issued by Pope Leo XIII on May 15, 1891. This brief keeps that definition visible, then builds a research path around Rerum, novarum and encyclical.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Rerum novarum”, the useful work is to connect “encyclical issued by Pope Leo XIII on May 15, 1891” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jul 25, 2026. The linked authority identifier is Q335987. VIAF identifies the subject as 181043751. The Library of Congress control number is n83014489. 1 of 4 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1891, 1931, 1961 and 1971.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Rerum novarum”, its source revision and the description used here.
- Expand the search: follow Rerum novarum primary sources, Rerum novarum archive and Rerum research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Rerum novarum”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Rerum novarum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.