WThe Battle of Cempoala was fought on 27 May 1520 at Cempoala, Mexico between the forces of Pánfilo de Narváez and the forces of Hernán Cortés, which were supported by a small number of indigenous soldiers.
WThe Battle of Bogesund was an important conflict in the campaign of Christian II to gain power over Sweden. In 1520, Christian's army of mercenaries had landed in Sweden, seeking to consolidate Christian's powers over Sweden within the Kalmar Union and to unseat the rebellious Swedish viceroy Sten Sture the Younger. On the ice of lake Åsunden near Bogesund, Christian's army led by Otte Krumpen was intercepted by a force led by Sten Sture.
WThe Hildesheim Diocesan Feud or Great Diocesan Feud, sometimes referred to as a "chapter feud", was a conflict that broke out in 1519 between the Prince-Bishopric of Hildesheim and the principalities of Brunswick-Wolfenbüttel and Calenberg which were ruled by the House of Welf. Originally just a local conflict between the Hildesheim prince-bishop John IV of Saxe-Lauenburg and his own prince-bishopric's nobility (Stiftsadel), it developed into a major dispute between various Lower Saxon territorial princes. The cause was the attempt by Prince-Bishop John to redeem the pledged estates and their tax revenue from the nobles in his temporalities, the prince-bishopric. The diocesan feud ended with the Treaty of Quedlinburg in 1523.
WThe Battle of Mokhisi was fought between the armies of the Kingdom of Kartli and the Principality of Guria at the place of Mokhisi in 1520.
WLa Noche Triste was an important event during the Spanish conquest of Mexico, wherein Hernán Cortés, his army of Spanish conquistadors, and their native allies were driven out of the Aztec capital at Tenochtitlan.
WThe Battle of Otumba was a battle during the Spanish conquest of the Aztec Empire. The battle was fought at Otumba de Gómez Farías, Mexico in 1520.
WThe Stockholm Bloodbath was a trial that led to a series of executions in Stockholm between 7 and 9 November 1520. The events occurred after the coronation of Christian II as the new king of Sweden, when guests in the crowning party were invited to a meeting at the castle. Archbishop Gustav Trolle, demanding economic compensation for things such as the demolition of Almarestäket's fortress, questioned whether the former Swedish regent Sten Sture the Younger and his supporters had been guilty of heresy. Supported by canon law, nearly 100 persons were executed in the days following the meeting. Among those killed were many people from the aristocracy who had been supporting the Sture Party in the previous years. Thereafter King Christian II became known in Sweden as Kristian Tyrann, 'Christian the Tyrant'.