People Joanna of Austria, Princess of Portugal Spanish infanta, Austrian archduchess, Portuguese princess24 June 1535 – 7 September 1573 Charles V, Holy Roman Emperor24 February 1500 – 21 September 1558Isabella of Portugal24 October 1503 – 1 May 1539 Joanna of Austria, Princess of Portugal24 June 1535 – 7 September 1573 ParentsCharles V, Holy Roman Emperor24 February 1500 – 21 September 1558Isabella of Portugal24 October 1503 – 1 May 1539SiblingsMargaret of Parma5 July 1522 – 18 January 1586Philip II of Spain21 May 1527 – 13 September 1598Maria of Austria, Holy Roman Empress21 June 1528 – 26 February 1603John of Austria24 February 1547 – 1 October 1578 From Wikipedia and Wikidata (public domain), updated daily.