Pier Luigi Farnese
Duke of Castro (1537–1545); Duke of Parma and Piacenza (1545–1547)

Pier Luigi Farnese was the first Duke of Castro from 1537 to 1545 and the first Duke of Parma and Piacenza from 1545 to 1547. He was the illegitimate son of Cardinal Alessandro Farnese. He became a soldier and participated in the Sack of Rome in 1527.
This brief starts where responsible research should: with the source description of “Pier Luigi Farnese” as duke of Castro (1537–1545); Duke of Parma and Piacenza (1545–1547). Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as duke of Castro (1537–1545); Duke of Parma and Piacenza (1545–1547). Its deeper value depends on whether names, dates, institutions and citations support that framing.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Aug 7, 2026. The first chronological checks are 1537, 1545, 1547 and 1527.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Questions for further research
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This entry incorporates text from “Pier Luigi Farnese” 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.