WHAT HAPPENED IN 1521.
Look what happened the 1521.

Pope Leo X excommunicates Martin Luther in the papal bull Decet Romanum Pontificem. (3. January 1521)

Emperor Charles V opens the Diet of Worms (22. January 1521)

The Diet of Worms begins, lasting until May 25. (28. January 1521)

Ferdinand Magellan arrives at Guam. (6. March 1521)

Ferdinand Magellan reaches the Philippines. (16. March 1521)

Ferdinand Magellan arrives at Cebu. (7. April 1521)

Martin Luther's first appearance before the Diet of Worms to be examined by the Holy Roman Emperor Charles V and the other estates of the empire. (16. April 1521)

Trial of Martin Luther over his teachings begins during the assembly of the Diet of Worms. Initially intimidated, he asks for time to reflect before answering and is given a stay of one day. (17. April 1521)

Trial of Martin Luther begins its second day during the assembly of the Diet of Worms. He refuses to recant his teachings despite the risk of excommunication. (18. April 1521)

Battle of Villalar: King Charles I of Spain defeats the Comuneros. (23. April 1521)

Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu. (27. April 1521)

Swedish War of Liberation: Swedish troops under Gustav Vasa defeat a Danish force under Didrik Slagheck in the Battle of Västerås and soon capture the city of Västerås. The Danish-held castle, however, does not surrender to the Swedes until 31 January the following year, after a nine-month siege. (29. April 1521)

Edward Stafford, 3rd Duke of Buckingham, is executed for treason. (17. May 1521)

Ignatius Loyola is seriously wounded in the Battle of Pampeluna. (20. May 1521)

The Diet of Worms ends when Charles V, Holy Roman Emperor, issues the Edict of Worms, declaring Martin Luther an outlaw. (25. May 1521)

Spanish forces defeat a combined French and Navarrese army at the Battle of Noáin during the Spanish conquest of Iberian Navarre. (30. June 1521)

After an extended siege, forces led by Spanish conquistador Hernán Cortés capture Tlatoani Cuauhtémoc and conquer the Aztec capital of Tenochtitlan. (13. August 1521)

Christian II of Denmark is deposed as king of Sweden and Gustav Vasa is elected regent. (23. August 1521)

The Ottoman Turks occupy Belgrade. (28. August 1521)

The Ottoman Turks capture Nándorfehérvár (Belgrade). (29. August 1521)