Joanna of Austria, Princess of Portugal
Infanta of Spain, Archduchess of Austria and Princess of Portugal

Joanna of Austria was an Infanta of Spain by birth and Princess of Portugal by marriage to João Manuel, Prince of Portugal. She served as regent of Spain for her brother Philip II during his trips to England to marry Mary I from 1554 to 1556, and 1556 to 1559. She was the mother of King Sebastian of Portugal.
The public source identifies “Joanna of Austria, Princess of Portugal” as infanta of Spain, Archduchess of Austria and Princess of Portugal. This brief keeps that definition visible, then builds a research path around Joanna, Austria and Princess.
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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 Jun 17, 2026. The first chronological checks are 1554, 1556 and 1559.
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This entry incorporates text from “Joanna of Austria, Princess of Portugal” 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.