The 1520s decade ran from January 1, 1520, to December 31, 1529.
- January 19 – King Christian II of Denmark and Norway defeats the Swedes, at Lake Åsunden in Sweden. The Swedish regent Sten Sture the Younger is mortally wounded in the battle. He is rushed towards Stockholm, in order to lead the fight against the Danes from there, but dies from his wounds on February 3.
- April 16 – Revolt of the Comuneros: Citizens of Toledo, Castile opposed to the rule of the Flemish-born Charles V, Holy Roman Emperor, rise up when the royal government attempts to unseat radical city councilors.
- June – Moctezuma II, Aztec ruler of Tenochtitlan, is declared deposed due to his captivity by conquistador Hernán Cortés. His brother Cuitláhuac rises to the throne.
- June 7 – King Henry VIII of England and King Francis I of France meet at the famous Field of Cloth of Gold.
- June 10 – Revolt of the Comuneros: Segovia is blockaded.
- June 15 – Pope Leo X issues the bull Exsurge Domine (Arise O Lord), threatening Martin Luther with excommunication, if he does not recant his position on indulgences and other Catholic doctrines.
- July 1 – La Noche Triste (Night of Sorrow): The forces of Cuitláhuac, Aztec ruler of Tenochtitlan, gain a major victory against the forces of conquistador Hernán Cortés. This results in the death of about 400 conquistadors, and some 2,000 of their Native American allies. However, Cortés and the most skilled of his men manage to escape and later regroup.
- July 7 – Otumba near Lake Texcaco: The Spaniards defeat the Aztecs.
- August – Martin Luther writes To the Christian Nobility of the German Nation.
- September 7 – Christian II makes his triumphant entry into Stockholm, which had surrendered to him a few days earlier. Sten Sture's widow Christina Gyllenstierna, who has led the fight after Sten's death, and all other persons in the resistance against the Danes, are granted amnesty and are pardoned for their involvement in the resistance.
- September 22 – Suleiman I succeeds his father Selim I as Sultan of the Ottoman Empire.
- October – Cuitláhuac, Aztec ruler of Tenochtitlan, dies from smallpox. He is succeeded by his nephew Cuauhtémoc.
- October 21 (Feast of St. Ursula) – The islands of Saint Pierre and Miquelon are discovered by Portuguese explorer João Álvares Fagundes, off Newfoundland. He names them Islands of the 11,000 Virgins, in honour of Saint Ursula.
- October 26 – Charles V is crowned King of Germany.
- November 1–4 – Christian II is crowned king of Sweden. The coronation is followed by a three-day feast in Stockholm.
- November 7 – At the end of the third day of Christian's coronation feast, several leading figures of the Swedish resistance against the Danish invasion are imprisoned, and tried for high treason.
- November 8–10 – Stockholm Bloodbath: 82 noblemen and clergymen, having been sentenced to death for their involvement in the Swedish resistance against the Danish invasion, are executed by beheading.
- November 28 – After navigating through the South American strait, three ships under the command of Portuguese explorer Ferdinand Magellan reach the Pacific Ocean, becoming the first Europeans to sail from the Atlantic Ocean to the Pacific (the strait is later named the Strait of Magellan).
- December 10 – Martin Luther burns a copy of The Book of Canon Law (see Canon Law), and his copy of the Papal bull Exsurge Domine.
- The Franciscan friar Matteo Bassi is inspired to return to the primitive life of solitude and penance, as practiced by St. Francis, giving rise to the Order of Friars Minor Capuchin.
- Duarte Barbosa returns to Cananor.
- Aleksandra Lisowska (Roxelana) is given as a gift to Suleiman I on the occasion of his accession to the throne.
- King Manuel I creates the public mail service of Portugal, the Correio Público.
- January 3 – Pope Leo X excommunicates Martin Luther, in the papal bull Decet Romanum Pontificem.
- January 22 – Charles V, Holy Roman Emperor, opens the Diet of Worms in Worms, Germany.
- January 27 – Suleiman the Magnificent suppresses a revolt by the ruler of Damascus.
- January 28 – The Diet of Worms begins, lasting until May 25.
- February 2 – The Nydala Abbey Bloodbath take place in Nydala Abbey, Sweden.
- March 6
- March 16 – Ferdinand Magellan reaches the Philippines.
- March 31 – The First Mass in the Philippines is held.
- April – The Battle of Tunmen occurs, in Tuen Mun (present-day Hong Kong), where the Ming Dynasty navy defeats the Portuguese navy. Arguably the first Sino-European battle in world history.
- April 7
- April 16–18 – Martin Luther is examined before Emperor Charles V and the Diet of Worms, where he proclaims, "Here I stand", regarding his belief in the Bible alone, as the standard of Christian doctrine.
- April 24 – Revolt of the Comuneros – Battle of Villalar: Castilian royalists defeat the rebels and execute their three leaders.
- 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 – Battle of Mactan: Ferdinand Magellan is killed in the Philippines.
- May – The Italian War of 1521–26 breaks out between Charles V, Holy Roman Emperor, and Francis I of France.
- May 17 – Edward Stafford, 3rd Duke of Buckingham, is executed for treason in London.
- May 20 – Battle of Pampeluna: The French defeat the Spanish.
- May 25 – The Diet of Worms ends when Charles V, Holy Roman Emperor issues the Edict of Worms, declaring Martin Luther an outlaw.
- May 27 – Jiajing Emperor ascends the throne of the Ming Dynasty.
- June 25 – Suleiman the Magnificent begins the siege of Belgrade.
- June 29 or 30 – The oldest surviving dateable document written primarily in the Romanian language: Neacșu's letter, written by a trader from Câmpulung, to Johannes Benkner, the mayor of Brașov, 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 – Pfaffensturm: Students rebel against priests in Erfurt.
- August 8 – Fall of Tenochtitlan: Hernán Cortés and allied local indigenous peoples of the Americas defeat the Aztec forces of Cuauhtémoc, the last Tlatoani (Aztec Emperor), at Tenochtitlan in the Valley of Mexico.
- August 13 – Fall of Tenochtitlan: Cuauhtémoc surrenders to Cortés, thus incorporating the Aztec Empire into the Spanish Empire and ending the Late Postclassic period in Mesoamerica.
- August 29 – Belgrade is captured by the Ottoman army of Suleiman the Magnificent.
- November 23 – Spanish–German–Papal forces under Prospero Colonna force French Marshal Odet de Lautrec to abandon Milan.
- December 27 – The Zwickau prophets arrive in Wittenberg, disturbing the peace and preaching the Apocalypse.
- Jacopo Berengario da Carpi publishes Commentaria cum amplissimus additionibus super anatomiam Mundini in Bologna, including observation of the vermiform appendix.
- San Juan Bautista is founded in the archipelago of Puerto Rico.
- The Principality of Ryazan is annexed by the Grand Duchy of Moscow.
- January 9 – Pope Adrian VI (born Adriaan Florenszoon Boeyens, Dedens or Dedel; Hadrianus in Latin) succeeds Pope Leo X, as the 218th pope. The only Dutch pope, he will be the last non-Italian elected for more than 450 years.
- January 26 – Spanish conquistador Gil González Dávila sets out from the gulf of Panama to explore the Pacific coast of Central America. He explores Nicaragua and names Costa Rica when he finds copious quantities of gold in Pacific beaches.
- April 27 – Battle of Bicocca: French and Swiss forces under Odet de Lautrec are defeated by the Spanish in their attempt to retake Milan, and are forced to withdraw into Venetian territory.
- May – England presents an ultimatum to France and Scotland.
- June 19 – Charles V, Holy Roman Emperor visits King Henry VIII of England, and signs the Treaty of Windsor, pledging a joint invasion of France, bringing England into the Italian War of 1521–1526.
- July – The English army attacks Brittany and Picardy from Calais, burning and looting the countryside.
- July 28 – Ottoman Sultan Suleiman I begins his siege to expel the Knights of St. John in Rhodes.
- August – The Knights' Revolt erupts in Germany.
- September 6 – The Vittoria, one of the surviving ships of Ferdinand Magellan's expedition, returns to Sanlúcar de Barrameda in Spain, under the command of Juan Sebastián Elcano, becoming the first ship to circumnavigate the world.
- September 21 – Luther Bible: Martin Luther's translation of the Bible's New Testament into Early New High German from Greek, Das newe Testament Deutzsch, is published in Germany, selling thousands in the first few weeks.
- November – The Diet of Nuremberg opens.
- December 18 – The Ottoman finally break into Rhodes, but the Knights continue fierce resistance in the streets.
- December 20 – Suleiman the Magnificent accepts the surrender of the surviving Knights, who are allowed to evacuate. They eventually re-settle on Malta, and become known as the Knights of Malta.
- The third edition of Erasmus's Greek Textus Receptus of the New Testament, Novum Testamentum (with parallel Latin text), is published in Basel.
- Chinese Ming dynasty War Ministry official He Ru is the first to acquire the Portuguese breech-loading culverin, while copies of them are made by two Westernized Chinese at Beijing, Yang San (Pedro Yang) and Dai Ming.
- Australia is sighted by a Portuguese expedition led by Cristóvão de Mendonça, who maps the continent and names it Jave la Grande ("The Greater Java"), according to the theory of the Portuguese discovery of Australia.
- The Portuguese ally with the Sultanate of Ternate and begin the construction of Fort Kastela.
- The Portuguese along with King Ilato of the Goratalo kingdom constructs the Otanaha Fortress.
- January 20 – Christian II is forced to abdicate as King of Denmark and Norway.
- May – The Ningbo Incident: Two rival trade delegations from Japan feud in the Chinese city of Ningbo, resulting in the pillage and plunder of the city.
- June 6 – Gustav Vasa is elected king of Sweden, finally establishing the full independence of Sweden from Denmark, which marks the end of the Kalmar Union. This event is also traditionally considered to be the establishment of the modern Swedish nation.
- c. July – Martin Luther's translation of the Pentateuch into German (Das allte Testament Deutsch) is published.
- July 1 – Jan van Essen and Hendrik Vos become the first Flemish Lutheran martyrs, burned at the stake by Roman Catholic authorities in Brussels.
- July 7 – Wijerd Jelckama, a Frisian warlord and military commander, is executed in Leeuwarden, ending the Frisian rebellion fought by the Arumer Black Heap.
- September 22 – Spanish conquest of Nicaragua: Agreement for an expedition by conquistadores into Nicaragua.
- November 19 – Following the death of Pope Adrian VI, the Medici cardinal is elected 219th pope as Clement VII.
- The Ming dynasty Chinese navy captures two Western ships with Portuguese breech–loading culverins aboard, which the Chinese call a fo–lang–ji (Frankish culverin). According to the Ming Shi, these cannons are soon presented to the Jiajing Emperor by Wang Hong, and their design is copied in 1529.
- Franconian War: The Swabian League destroys 23 robber baron castles.
- January 17 – Florentine explorer Giovanni da Verrazzano, on board La Dauphine in the service of Francis I of France, sets out from Madeira for the New World, to seek out a western sea route to the Pacific Ocean.
- March – Spanish conquistador Pedro de Alvarado destroys the K'iche' kingdom of Q'umarkaj, taking the capital, Quiché.
- March 1 (approximate date) – da Verrazzano's expedition makes landfall at Cape Fear.
- April 17 – Verrazzano's expedition makes the first European entry into New York Bay, and sights the island of Manhattan.
- April 30 – Battle of the Sesia: Spanish forces under Charles de Lannoy defeat the French army in Italy, under William de Bonnivet. The French, now commanded by François de St. Pol, withdraw from the Italian Peninsula.
- May 26 – Atiquipaque, the most important city of the Xinca people is conquered by the Spanish resulting in a significant reduction in the Xinca population.
- June 8 – Battle of Acajutla: Spanish conquistador Pedro de Alvarado defeats a battalion of Pipiles, in the neighborhoods of present day Acajutla, El Salvador.
- Summer – Paracelsus visits Salzburg; he also visits Villach during the year.
- July 8 – Verrazzano's expedition returns to Dieppe.
- August–September – Marseille is besieged by Imperial forces, under the Duke of Bourbon.
- August – Protestant theologians Martin Luther and Andreas Karlstadt dispute at Jena.
- October 28 – A French army invading Italy, under King Francis, besieges Pavia.
- December 8 – Francisco Hernandez de Cordoba founds the city of Granada, Nicaragua, the oldest Hispanic city in the mainland of the Western Hemisphere.
- January 21 – The Swiss Anabaptist Movement is born when Conrad Grebel, Felix Manz, George Blaurock, and about a dozen others baptize each other in the home of Manz's mother on Neustadt-Gasse, Zürich, breaking a thousand-year tradition of church-state union.
- February 24 – Battle of Pavia: Spanish forces under Charles de Lannoy and the Marquis of Pescara defeat the French army, and capture Francis I of France, after his horse is wounded by Cesare Hercolani. While Francis is imprisoned in Madrid, the first attempts to form a Franco-Ottoman alliance with Suleiman the Magnificent against the Habsburg Empire are made.
- February 28 – The last Aztec Emperor, Cuauhtémoc, is killed by Hernán Cortés.
- March 20 – In the German town of Memmingen, the pamphlet The Twelve Articles: The Just and Fundamental Articles of All the Peasantry and Tenants of Spiritual and Temporal Powers by Whom They Think Themselves Oppressed is published, the first human rights related document written in Europe.
- April 4 – German Peasants' War in the Holy Roman Empire: Battle of Leipheim – Peasants retreat.
- April 10 – Albert, Duke of Prussia commits Prussian Homage.
- May 14–15 – German Peasants' War: Battle of Frankenhausen – Insurgent peasants led by radical pastor Thomas Müntzer are defeated.
- June 13 – Martin Luther marries ex-nun Katharina von Bora. The painter Lucas Cranach the Elder is one of the witnesses.
- June 16 – Henry VIII of England appoints his six-year old illegitimate son Henry FitzRoy Duke of Richmond and Somerset.
- June 23–24 – German Peasants' War: Battle of Pfeddersheim – Peasants defeated in the last significant action of the war, in which over 75,000 peasants have been killed.
- July 29 – Santa Marta, the first city in Colombia, is founded by Spanish conquistador Rodrigo de Bastidas.
- December – The first French ambassador to reach the Sublime Porte, Jean Frangipani, sets out for Constantinople.
- Mixco Viejo, capital of the Pocomam Maya State, falls to the Spanish conquistadores of Pedro de Alvarado (in modern-day Guatemala) after a three-month siege.
- European-brought diseases sweep through the Andes, killing thousands, including the Inca.
- The Bubonic plague spreads in southern France.
- Printing of the first edition of William Tyndale's New Testament Bible translation into English in Cologne is interrupted by anti-Lutheran forces (finished copies reach England in 1526).
- The Navarre witch trials (1525-26) begin.
- The Chinese Ministry of War under the Ming dynasty orders ships having more than one mast sailing along the southeast coast to be seized, investigated, and destroyed; this in an effort to curb piracy and limit private commercial trade abroad.
- The Age of Samael ends, and the Age of Gabriel begins, according to Johannes Trithemius.
- January 14 – Treaty of Madrid: Peace is declared between Francis I of France and Charles V, Holy Roman Emperor. Francis agrees to cede Burgundy and abandons all claims to Flanders, Artois, Naples, and Milan.
- April 21 – Battle of Panipat: Babur becomes Mughal emperor, invades northern India and captures Delhi, beginning the richest dynasty in the world, the Mughal Empire, which lasts until 1857.
- May 22 – Francis repudiates the Treaty of Madrid and forms the League of Cognac against Charles, including Pope Clement VII, Milan, Venice, and Florence.
- May 24 – A transit of Venus occurs, the last before optical filters allow astronomers to observe them.
- June 9 – Emperor Go-Nara ascends to the throne of Japan.
- July – The Spanish ship Santiago, from García Jofre de Loaísa's expedition, reaches the Pacific Coast of Mexico, the first to navigate from Europe to the west coast of North America.
- July 24 – Milan is captured by the Spanish.
- August 21 – Spanish explorer Alonso de Salazar becomes the first European to sight the Marshall Islands, in the Pacific Ocean.
- August 29 – Battle of Mohács: The Ottoman army of Sultan Suleiman I defeats the Hungarian army of King Louis II, who is killed in the retreat. Suleiman takes Buda, while Archduke Ferdinand of Austria and John Zápolya, Prince of Transylvania, dispute the succession. As a result of the battle, Dubrovnik achieves independence, although it acknowledges Turkish overlordship.
- December – Paracelsus arrives at Strasbourg.
- Spring – The first complete printed translation of the New Testament of the Bible into the English language by William Tyndale arrives in England from Germany, printing having been completed in Worms by Peter Schöffer the younger (with other copies being printed in Amsterdam). In October, Cuthbert Tunstall, Bishop of London, attempts to collect all the copies in his diocese and burn them.
- The first official translation is made of the New Testament into Swedish; the entire Bible is completed in 1541.
- Gunsmith Bartolomeo Beretta (in Italian) establishes the Beretta Gun Company, which will still be in business in the 21st century, making it one of the world's oldest corporations.
- January 1 – Croatian nobles elect Ferdinand I of Austria as King of Croatia in the Parliament on Cetin.
- January 5 – Felix Manz, co-founder of the Swiss Anabaptists, is drowned in the Limmat in Zürich, by the Zürich Reformed state church.
- March 17 – Battle of Khanwa: Babur defeats Rajput ruler Rana Sanga. This and two other major Moghul victories lead to their domination of northern India. Dhaulpur fort is taken by Babur.
- April 30 – The Treaty of Westminster (1527), an alliance during the War of the League of Cognac, is signed.
- May 6 – Sack of Rome: Spanish and German troops led by the Duke of Bourbon sack Rome, forcing Pope Clement VII to make peace with Charles V, Holy Roman Emperor, marking the end of the High Renaissance. The Pope grows a beard in mourning.
- May 16 – In Florence, the Piagnon, a group devoted to the memory of Girolamo Savonarola, drive out the Medici for a second time, re-establishing the Republic of Florence until 1530.
- June 17 – The Narváez expedition to conquer Florida sets sail from Spain.
- June 17 – The Protestant Reformation begins in Sweden. The Riksdag of the Estates in Västerås adopts Lutheranism as the state religion, in place of Roman Catholicism. This results in the confiscation of church property and dissolution of Catholic convents in accordance with the Reduction of Gustav I of Sweden.
- June 21 – Niccolò Machiavelli, Italian historian, politician, diplomat, philosopher and humanist dies in Florence, Italy.
- June 22 – Jakarta, current capital of Indonesia, is founded as Jayakarta.
- June 23 – Paracelsus burns the books of Avicenna.
- August 3 – The first known letter is sent from North America by John Rut, while at St. John's, Newfoundland.
- August 20 – Sixty Anabaptists meet at the Martyrs' Synod in Augsburg.
- August 20 – Diet of Odense (Denmark): King Frederick I declares religious tolerance for Lutherans, permits marriage of priests and forbids seeking papal pallium (approval) for royal appointments of Church officials.
- September 27 – Battle of Tarcal: Ferdinand, future Holy Roman Emperor, defeats John Zápolya and takes over most of Hungary. John appeals to the Ottomans for help.
- The Spanish conquest of Guatemala's highlands is completed; the first city in Guatemala, Ciudad Vieja is founded.
- Members of the University of Wittenberg flee to Jena, in fear of the bubonic plague.
- Bishop Vesey's Grammar School (at Sutton Coldfield, in the West Midlands of England) is founded by Bishop John Vesey.
- Sir George Monoux College is founded as a grammar school at Walthamstow, England, by Sir George Monoux, draper and Lord Mayor of London.
- The Ming dynasty government of China greatly reduces the quotas for taking grain, severely diminishing the state's capacity to relieve famines through a previously successful granary system.
- The second of the Dalecarlian rebellions breaks out in Sweden.
- January 12 – Gustav I of Sweden is crowned king of Sweden, having already reigned since his election in June 1523.
- April 28 – Battle of Capo d'Orso: The French fleet, under mercenary captain Filippino Doria, crushes the Spanish squadron trying to run the blockade of Naples.
- September 12 – Andrea Doria defeats his former allies, the French, and establishes the independence of Genoa.
- October 3 – Álvaro de Saavedra Cerón arrives in the Maluku Islands.
- October 13 – Cardinal Thomas Wolsey founds a college in his birthplace of Ipswich, England, which becomes the modern-day Ipswich School (incorporating institutions in the town dating back to 1299).
- October 20 – The Treaty of Gorinchem is signed between Charles V, Holy Roman Emperor, and Charles, Duke of Guelders.
- November 6 – Spanish conquistador Álvar Núñez Cabeza de Vaca and his companions become the first known Europeans to set foot on the shores of what is present-day Texas.
- Montenegro gains autonomy under Ottoman power.
- Spanish Conquistador Francisco de Montejo attempts an invasion of the Yucatán, but is driven out by the Maya peoples.
- Spain takes direct control of Acapulco.
- Bubonic plague breaks out in England.
- The fourth major outbreak of the sweating sickness occurs in England. This time the disease also spreads to northern Europe.
- St George's Chapel in Windsor Castle is completed.
- Chateau Fontainebleau in France is begun.
- Michelangelo Buonarroti begins work on the fortifications of Florence.
- Baldassare Castiglione publishes The Book of the Courtier.
- In Henan province, China, during the mid Ming dynasty, a vast drought deprives the region of harvests for the next two years, killing off half the people in some communities, due to starvation and cannibalism.
- Paracelsus leaves Basel.
- February 2 – The Örebro Synod provides the theological foundation of the Swedish reformation, following the economic foundation of it after the Reduction of Gustav I of Sweden.
- March – Battle of Shimbra Kure: Imam Ahmad ibn Ibrahim al-Ghazi, with 200 men armed with matchlocks, defeats the army of Dawit II, Emperor of Ethiopia.
- March 25 – Blood libel against the Jewish community of Bosen (formerly in Hungary, today in Slovakia), on the first day of Passover. Three Jews are accused and killed, while the boy is discovered alive, kidnapped for the benefit of the scheme.
- April 8 – The Flensburg Disputation is held, a debate attended by Stadtholder Christian of Schleswig-Holstein (later King Christian III of Denmark), between Lutherans (led by Hermann Fast) and the more radical Anabaptists (led by Melchior Hoffman). Johannes Bugenhagen, a close associate of Martin Luther, presides. The Disputation marks the rejection of radical ideas by the Danish Reformation.
- April 9 – The Westrogothian rebellion breaks out in Sweden.
- April 19 – Diet of Speyer: A group of rulers (German: Fürst) and independent cities (German: Reichsstadt) protest the reinstatement of the Edict of Worms, beginning the Protestant movement.
- April 22 – The Treaty of Zaragoza divides the eastern hemisphere between the Spanish and Portuguese empires, stipulating that the dividing line should lie 297.5 leagues or 17° east of the Moluccas.
- May–July – Cardinal Thomas Wolsey, Archbishop of York, presides over a legatine court at Blackfriars, London, to rule on the legality of King Henry VIII of England's marriage to Catherine of Aragon.
- May 10 – The Ottoman army under Suleiman I leaves Constantinople, to invade Hungary once again.
- June 21 – War of the League of Cognac – Battle of Landriano: French forces in northern Italy are decisively defeated by Spain.
- July 30 – The only continental outbreak of English sweating sickness reaches Lübeck, spreading from there into Schleswig-Holstein in the next few months.
- August 5 – Charles V, Holy Roman Emperor, and Francis I of France sign the Treaty of Cambrai, or Ladies' Peace in the War of the League of Cognac: Francis abandons his claims in Italy, but is allowed to retain the Duchy of Burgundy. Henry VIII of England accedes on August 27.
- September 1 – Sancti Spiritu, the first European settlement in Argentina, is destroyed by local natives.
- September 8
- September 27 – Siege of Vienna: Vienna is besieged by the Ottoman forces of Suleiman the Magnificent.
- October 15 – With the season growing late, Suleiman abandons the Siege of Vienna (a turning point in the Ottoman wars in Europe).
- October 26 – Cardinal Wolsey falls from power in England, due to his failure to prevent Habsburg expansion in Europe, and obtain an annulment of Henry VIII's marriage. Thomas More succeeds him as Lord Chancellor.
- November 4–December 17 – The English Reformation Parliament is first seated.
- Aylesbury is granted the county town of Buckinghamshire, England by King Henry VIII.
- Stephen Báthory becomes governor of Transylvania.
- Borommarachathirat IV succeeds Ramathibodi II as king of Ayutthaya.
- Fluorite is first described, by Georg Agricola.
- Giorgio Vasari visits Rome.
- Pietro Bembo becomes historiographer of Venice.
- Heinrich Bullinger becomes pastor of Bremgarten, Switzerland.
- Paracelsus uses that name for the first time and visits Nuremberg.
- Occultist Heinrich Cornelius Agrippa publishes Declamatio de nobilitate et praecellentia foeminei sexus ("Declamation on the Nobility and Preeminence of the Female Sex"), a book pronouncing the theological and moral superiority of women.
- A summit level canal between Alster and the Trave in Germany opens to navigation.
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The 'breech-loading culverins presented at the Ming court in 1522' were a gift from the Portuguese; and Portuguese arquebuses were acquired in the 1540s by the Japanese, who copied and greatly improved them.
- Paine, Lincoln P. (2000). Ships of Discovery and Exploration. New York: Houghton Mifflin Harcourt. p. 37. ISBN 0-395-98415-7.
- Grun, Bernard (1991). The Timetables of History (3rd ed.). New York: Simon & Schuster. p. 235. ISBN 0-671-74919-6.
- Sharp, Andrew (1960). Early Spanish Discoveries in the Pacific. pp. 11–13.
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- Reported by local gazetteers.
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- "Alster-Beste Kanal (Alster-Trave-Kanal.)". Lost Canals of Schleswig-Holstein. 2007-05-29. Retrieved 2020-02-21.