page_title: 1521
section_title: Births
hierarchical_section_title: 1521 / Births
caption_attribution_description: Español: Retrato de la infanta María de Portugal (1521-1577), que fue hija del rey Manuel I of Portugal y de la reina Leonor de Austria.English: Portrait of Infanta Maria of Portugal, Duchess of Viseu, daughter of King Manuel I
context_page_description: 1521 was a common year starting on Tuesday of the Julian calendar, the 1521st year of the Common Era and Anno Domini designations, the 521st year of the 2nd millennium, the 21st year of the 16th century, and the 2nd year of the 1520s decade.
context_section_description: March 21 – Maurice, Elector of Saxony (d. 1553)
  April 5 – Francesco Laparelli, Italian architect (d. 1570)
  April 14 – Johann Marbach, German theologian (d. 1581)
  April 18 – François de Coligny d'Andelot, French general (d. 1569)
  May 8 – Petrus Canisius, Dutch Jesuit (d. 1597)
  May 10 – John Ernest, Duke of Saxe-Coburg, (d. 1553)
  June 18 – Maria of Portugal, Duchess of Viseu, daughter of King Manuel I (d. 1577)
  June 21 – John II, Duke of Schleswig-Holstein-Haderslev (d. 1580)
  August 4 – Pope Urban VII (d. 1590)
  August 19 – Lodovico Guicciardini, Italian historian (d. 1589)
  October 1 – Frederick Magnus I, Count of Solms-Laubach, (d. 1561)
  November 22 – Edmund Sheffield, 1st Baron Sheffield, English baron (d. 1549)
  November 29 – Marcantonio Maffei, Italian Catholic archbishop and cardinal (d. 1583)
  December 1 – Takeda Shingen, Japanese warlord (d. 1573)
  December 13 – Pope Sixtus V (d. 1590)
  date unknown
  Anne Askew, English Protestant martyr (d. 1546)
  John Aylmer, English divine (d. 1594)
  Sue Harukata, Japanese retainer and later daimyō under Ouchi Yoshitaka (d. 1555)
  Thomas Chaloner, English statesman and poet (d. 1565)
  Philippe de Monte, Flemish composer (d. 1603)
  Rokkaku Yoshikata, Japanese daimyō (d. 1598)
  Thomas Wyatt the Younger, English rebel (d. 1554)
  possible
  Catherine Howard, Fifth Queen of Henry VIII of England, (b. between 1518 and 1524; d. 1542)
caption: Maria of Portugal, Duchess of Viseu
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