1521
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Year 1521 (MDXXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events of 1521

January - June

March-April:Ferdinand Magellan's voyage around the world

• January 3 - Pope Leo X excommunicates Martin Luther in the papal bull Decet Romanum Pontificem.
• January 22 - Emperor Charles V opens the Diet of Worms.
• January 28 - The Diet of Worms begins, lasting until May 25.
• March 6 - Ferdinand Magellan discovers Guam.
• March 16 - Ferdinand Magellan reaches the Philippines.
• April 7 - Ferdinand Magellan arrives at Cebu.
• April 16 - 18 - Martin Luther is examined before Emperor Charles V and the German Diet of Worms.
• April 24 - Castilian War of the Communities - Battle of Villalar: The Kingdom of Castile defeats the rebels.
• April 26 - Martin Luther leaves Worms and disappears for a year - he is rumored to be murdered, but is actually in hiding at the Wartburg Castle.
• April 27 - Magellan is killed in the Philippines.
• May - War breaks out between Charles V, Holy Roman Emperor and the King of France.
• May 17 - Edward Stafford, 3rd Duke of Buckingham, is executed for treason.
• May 20 - Battle of Pampeluna: The French defeat the Spanish.

May 25: Martin Luther outlaw.

• May 25 - The Diet of Worms ends when Charles V, Holy Roman Emperor issues the Edict of Worms, declaring Martin Luther an outlaw.
• June 29 or June 30 - The first document is fully written in Romanian: the letter of Neacşu, a trader from Câmpulung, to Johannes Benkner, the mayor of Braşov, warning that the Ottoman Empire is preparing its troops to cross into Wallachia and Transylvania; the script used is Romanian Cyrillic.
• June 30 - Battle of Esquiroz: French forces under Henri d'Albret, exiled King of Navarre, are defeated by the Spanish and forced to abandon their attempt to recover Henri's kingdom.

July - December

• August 8 - Battle of Tenochtitlan: Hernán Cortés and allied local Indians defeat the Aztec forces of Cuauhtémoc, the last Aztec Emperor.
• August 13 - Emperor Cuauhtémoc surrenders to Hernán Cortés.
• August 23 - Christian II of Denmark is deposed as king of Sweden and Gustav Vasa is elected regent.
• August 29 - Belgrade is captured by the Ottoman army of Suleiman I.
• November 23 - Spanish-German-Papal forces under Prosper Colonna force French Marshal Odet de Lautrec to abandon Milan.

Undated

• Berengairo da Garbi notices the appendix.
• Neacşu's Letter, the oldest surviving Romanian document, is written.
• San Juan Bautista is founded in the Puerto Rican archipelago.
• Rjasan is captured by Moscow.
• The first child is born by Roxelana to Suleyman the Magnificent.

Births

• March 21 - Maurice, Elector of Saxony (d. 1553)
• May 8 - Petrus Canisius, Dutch Jesuit (d. 1597)
• August 4 - Pope Urban VII (d. 1590)
• October 9 - Ottavio Farnese, Duke of Parma (d. 1586)
• 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)
  • Thomas Chaloner, English statesman and poet (d. 1565)
  • Philippe de Monte, Flemish composer (d. 1603)
  • Thomas Wyatt the younger, English rebel (d. 1554)

See also Category: 1521 births.

Deaths

• April 20 - Zhengde Emperor of China (b. 1491)
• April 25 - Juan López de Padilla, Juan Bravo and Francisco Maldonado, executed Spanish rebels
• April 27 - Ferdinand Magellan, Portuguese explorer (b. c. 1480)
• May 10 - Sebastian Brant, German humanist and satirist (b. 1457)
• May 17 - Edward Stafford, 3rd Duke of Buckingham (executed) (b. 1478)
• June 15 - Tamás Bakócz, Hungarian Catholic cardinal and statesman (b. 1442)
• June 21 - Leonardo Loredan, Doge of Venice (b. 1436)
• July - Juan Ponce de León, Spanish conquistador (b. 1460)
• August 27 - Josquin Des Prez, Flemish composer (b. c. 1450)
• December 1 - Pope Leo X (b. 1475)
• December 13 - King Manuel I of Portugal (b. 1469)
• date unknown
  • Edward Poyning, Lord Deputy to King Henry VII of England (b. 1459)
  • Stephen Hawes, English poet (b. 1502)

See also Category: 1521 deaths.