1521 events in history

Jan 3 Pope Leo X excommunicates Martin Luther in the papal bull Decet Romanum Pontificem
Jan 22 Emperor Charles V opens the Diet of Worms
Jan 28 The Diet of Worms begins, lasting until May 25
Mar 6 Ferdinand Magellan arrives at Guam
Apr 7 Ferdinand Magellan arrives at Cebu
Apr 16 Protestant Reformation: 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
Apr 17 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
Apr 18 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
Apr 23 Battle of Villalar: King Charles I of Spain defeats the Comuneros
Apr 27 Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu
Apr 29 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
May 17 Edward Stafford, 3rd Duke of Buckingham, is executed for treason
May 20 Ignatius Loyola is seriously wounded in the Battle of Pampeluna
May 25 The Diet of Worms ends when Charles V, Holy Roman Emperor, issues the Edict of Worms, declaring Martin Luther an outlaw
Jun 30 Spanish forces defeat a combined French and Navarrese army at the Battle of Noáin during the Spanish conquest of Iberian Navarre
Aug 13 After an extended siege, forces led by Spanish conquistador Hernán Cortés capture Tlatoani Cuauhtémoc and conquer the Aztec capital of Tenochtitlan
Aug 23 Christian II of Denmark is deposed as king of Sweden and Gustav Vasa is elected regent
Aug 28 The Ottoman Turks occupy Belgrade
Aug 29 The Ottoman Turks capture Nándorfehérvár (Belgrade)